OFFCUP 32-Piece Invisible Ink Pen Set with UV Lights

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Product guide

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.

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.

Price

£12.74Save 15%

Reference price: ~~£14.99~~

Price checked: 13 Nov 2026

View offer Ahead of Black FridayExplore the selection

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Pros and cons

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.

Technical specifications

16 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

What to know before buying

Listing details to confirm

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.

What’s in the box

32 invisible ink pens with built-in UV lightsCheck selected pack
32 detective notebooksCheck selected pack
Gift bag or pouchCheck selected pack

Check which accessories are included in your selected pack before buying.

Who is it for?

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.

OFFCUP 32-Piece Invisible Ink Pen Set with UV Lights · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.2 / 5 · 754 ratings

5 stars70%70%
4 stars9%9%
3 stars8%8%
2 stars2%2%
1 star11%11%

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.
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.