# OFFCUP 32-Piece Invisible Ink Pen Set with UV Lights

OFFCUP’s Invisible Ink Pen Set is a 32-piece activity bundle with pens that reveal messages under their built-in UV lights. It is aimed at children’s detective games and party bags, with notebooks also claimed in the listing.

- [Original product page](https://bargainpostbox.co.uk/product/offcup-32-piece-invisible-ink-pen-set-uv-lights)
- [View offer](https://bargainpostbox.co.uk/visit/offcup-32-piece-invisible-ink-pen-set-uv-lights)
- Market: UK
- Language: en-GB
- Currency: GBP
- Brand: OFFCUP
- Model: 1
- Category: Toys & Games > Toys > Educational & Activity Toys
- Price: 12.74 GBP
- Previous price: 14.99 GBP
- Discount: 15%
- Price checked: 2026-11-13T06:07:07.636Z
- Rating: 4.2 / 5
- Reviews: 754

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- The pens are described as having built-in UV lights to reveal invisible writing.
- The listing describes the ink as transparent and says all pens use the same ink colour.
- The seller promotes the set for detective games, treasure hunts, riddles and party bags.

## Pros

- A 32-piece set is suitable for distributing across a group or using as party favours.
- Built-in UV lights let children reveal messages without a separate UV torch, according to the listing.
- Notebooks are mentioned as part of the advertised bundle, giving children a suggested surface for secret notes.

## Specifications

### Identity
- Brand: OFFCUP
- Model: 1
- Set name: Invisible Ink Pen Set
- Number of packs: 32
- Recommended age: 0 - 3 years
### Power and use
- Power configuration: Hand-powered
- Operation mode: Manual
- Intended setting: Indoor
- Assembly required: No
### Dimensions and materials
- Dimensions listed: 10 x 10 x 10 millimetres
- Pen size: 13,5 cm
- Material: Plastic
- Colour: Multi-colored
### Activity
- Theme: Mystery
- Educational objective: Develop creative thinking and problem-solving skills through imaginative play and detective-themed activities.
- Number of players: 6 UK

## Before you buy

- The listing details conflict: the title says 32 pens and a book, while the feature text claims 32 pens, 32 detective notebooks and a gift bag. The listed age range also conflicts with the recommended age of 0 - 3 years, while feature text says the set is for children over 3. Confirm the selected listing’s contents and intended age before buying.

## In the box

- 32 invisible ink pens with built-in UV lights (Check selected pack): Feature text claims 32 pens in eight shell colours, four of each. It says the ink colour is the same across the pens.
- 32 detective notebooks (Check selected pack): Claimed in the feature text, while the title refers to a book without specifying quantity.
- Gift bag or pouch (Check selected pack): The feature text says gift bag and the title says pouch. Confirm which, if either, is included.

## A good fit for

- Families planning indoor detective games, treasure hunts or secret-message activities.
- Those looking for small party-bag gifts for a group of children.

## Less suited to

- Buyers who need a clearly confirmed contents list or consistent age guidance before purchase.
- Anyone seeking a toy for outdoor play, as the listed intended use is indoor.

## Customer feedback

Customer feedback highlights fun play and suitability as party-bag gifts, with some reports that the ink shows under UV light. Experiences with functionality and value are mixed, including reports of some pens or lights not working. That matters in a multi-piece set intended for group use, where a non-working pen or light could leave one child without a complete activity.
- Positive themes: Customers describe the pens as fun for children and useful as party-bag fillers.
- Positive themes: Some customers report that the clear ink becomes visible under UV light.
- Negative themes: Some customers report that individual pens or lights do not work.
- Mixed feedback: Feedback on functionality and value is mixed, so buyers should not assume every pen and light will perform as intended.

## Frequently asked questions

### How do the messages become visible?
The listing says to shine the pen’s built-in UV light on writing made with the invisible ink.
### What is included in the set?
The feature text claims 32 pens, 32 detective notebooks and a gift bag, but the title mentions a book and pouch. Check the selected listing for the exact bundle.
### What age is this set for?
Age details are inconsistent: one field says 0 - 3 years, while the title and feature text describe it for children over 3. Confirm suitability before buying.

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## Images

![OFFCUP 32-Piece Invisible Ink Pen Set with UV Lights — 1](https://bargainpostbox.co.uk/i/nI3w8uSqRB9FQE6wixJZpeCEzmMIESAEQUYL4xSc7QRfc8A5P44GNbz8wM0L21NTsO-QfJLhNAvmNwwV7EQrzh1plC_YMd6FQbZQXwCvnUvqxX8fm0VlWe_s.jpg)

![OFFCUP 32-Piece Invisible Ink Pen Set with UV Lights — 2](https://bargainpostbox.co.uk/i/QfZieGW2i9egSPXhGf-veM3RUoCrdnNLv41bW4WLyPkHMNcEVe21I3878nwCpfrgjW07ql6S_pM3RVPwRaQ0xkn2dYATLLRzjgY4XaPXN_zt8Ndta8K0EMYH.jpg)

![OFFCUP 32-Piece Invisible Ink Pen Set with UV Lights — 3](https://bargainpostbox.co.uk/i/45F1J1qJO9Q4KKNbZSrA2bJZMvc0M7KAh7hythmV_pRr3lw9r53V7B8xrPefiBERouJOPViMn9DzjJAdbEyupSRBhaJ63txv3W2Ne1qar_pHP25UWNNTuiQ_.jpg)

![OFFCUP 32-Piece Invisible Ink Pen Set with UV Lights — 4](https://bargainpostbox.co.uk/i/k1Rq_zacLQVF_3DSJmMSP9MV26v8htXq-5dqraoEyCW5KawPJ9aflYwqhTCXdwJ7NXt_vBDee17HA0hI0QCuNNIEM2zGIjOy_TcK1GKTJv7WtkHFkwV0IR0Z.jpg)

![OFFCUP 32-Piece Invisible Ink Pen Set with UV Lights — 5](https://bargainpostbox.co.uk/i/0v48suBn8lCQbfCyWntLs4aLWTgRMivQfE-oPu6-XFlt4j0sExZ_f16kiv1Er_pkWubGl649-uiFpMaiKXoS-wNjAu1jEP0G8uCbrH-Ifrk-Re2bZKREGDLC.jpg)

![OFFCUP 32-Piece Invisible Ink Pen Set with UV Lights — 6](https://bargainpostbox.co.uk/i/1LNw5U3n-81gLPFG-1ZSPFLsbFRdGXSHMjYoQAzIsFDoF8dlooobc66aYQ37PNuy3njPtciyThwUljC2m84MD2YkejMhoWG5fv_zLUCuK5blCFFZB6q22JPg.jpg)

![OFFCUP 32-Piece Invisible Ink Pen Set with UV Lights — 7](https://bargainpostbox.co.uk/i/fni4f99BzMAisgXcu7sw_DojFs3_YoNl-sMxh040bh2ieYkSlLm9pvyPA2TZuvnyfGn5N_TZoWgM4zNnUqnIykhHZr8gS9VuFbBjsYFxTo6y9W1GxAf0HkUc.jpg)