COOLJOYA SX300 300-Piece Magnetic Blocks

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Product guide

COOLJOYA SX300 300-Piece Magnetic Blocks

COOLJOYA SX300 magnetic blocks are a 300-piece construction set for open-ended indoor building and hands-on STEM-themed play. The listing describes built-in magnets and an ABS construction, while customer feedback also notes that the pieces may be smaller than expected.

At a glance

The listing describes built-in magnets intended to help pieces connect into structures.
Open-ended construction supports solo or group building, according to the listing.
Dark Magma and Grassland themes are described in the feature text.
A manual is identified in the included-components field.

Price

£38.93Save 35%

Reference price: ~~£59.99~~

Price checked: 12 Nov 2026

View offer Ahead of Black FridayExplore the selection

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Pros and cons

Pros

A 300-piece set offers a substantial number of building pieces for varied constructions.
Manual, indoor play requires no powered operation.
Customer feedback reports enjoyable, absorbing building play and appreciates the magnetic connection.

Cons

Some customers report that the blocks are smaller than expected.

Technical specifications

14 specifications

Identity
Brand	COOLJOYA
Model	SX300

Design and play
Piece count	300PCS
Recommended age	3 years and up
Players	Multiple
Educational objective	STEM
Theme	Science Fiction
Colour	300-magnetic Blocks
Indoor or outdoor use	Indoor
Assembly required	No

Materials and size
Material	Acrylonitrile Butadiene Styrene (ABS)
Listed dimensions	7.6 x 5.1 x 2.5 centimetres
Size description	Small

Power and operation
Power configuration	manual

What to know before buying

Listing details to confirm

The title and feature text identify a 300-piece set, while the dimensions and size fields use singular, unqualified measurements. Check the selected listing's scale and what its stated dimensions describe before buying.

What’s in the box

Included

User manual

Who is it for?

A good fit for

Children aged 3 and up, in line with the listed recommended age.
Families looking for hands-on indoor building and collaborative play.
Buyers seeking magnetic construction play with an advertised STEM learning angle.

Less suited to

Buyers who need larger blocks should consider the reported size concern and confirm piece dimensions before purchase.

COOLJOYA SX300 300-Piece Magnetic Blocks · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.7 / 5 · 3,127 ratings

5 stars82%82%
4 stars11%11%
3 stars5%5%
2 stars0%0%
1 star2%2%

Customer feedback describes the blocks as enjoyable to build with, with positive remarks about quality, magnetic connection and variety. Some customers report that the pieces are smaller than expected, which matters if you are choosing a set for a particular build scale or expecting larger blocks. These are reported customer impressions, separate from the listing's claims about the magnets and materials.

Positive themes

Customers report enjoyable play and praise the magnetic connection.
Feedback highlights quality, creativity and suitability for some children around age five.

Negative themes

Some customers say the blocks are smaller than they expected.

Mixed feedback

Customers appreciate the variety of pieces, while feedback also raises concerns about their size.

Frequently asked questions

What is the recommended age?

The listing gives a recommended age of 3 years and up.

How many pieces are listed?

The title and feature text describe a 300-piece set. The size fields also describe the blocks as small, and customer feedback mentions that they may be smaller than expected.

Does the set need batteries?

The listed power configuration is manual, and the operation mode is also given as manual.

What does the package include?

The manufacturer contents field lists an instruction manual. It does not provide a fuller package inventory in the supplied details.