what is the diameter of the magnetic balls?

About 1.5 in, pretty much golf ball size

From the reviews, it looks like kids from 2 and up would enjoy these. Any feedback on kids 5 to 7?

Kids and adults enjoy these, in my experience. (No, I do not work for the company that produces this, and I do not sell this or any other toy product.)

What size are the metal balls?

I'm not sure of the exact size, but they do not pose a choking hazard for young children. I bought two sets for toddler classrooms. The children love them and they are safe to play with.

Does anyone know if these smart max pieces are compatible with the magformers version called “stick-o”s?

The magnets should work together however the Smart Max are bigger and rounder.

Smartmax Start Stem Building Magnetic Discovery Set For Ages 1

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VT22793

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Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧲 Build brilliance from the ground up — STEM fun that sticks with you!

STEM STARTER KIT - Perfectly crafted for ages 1-10 to spark early engineering and creative thinking.
ENDLESS EXPANSION - Fully compatible with all SmartMax sets, so the building fun never stops or outgrows.
MAGNETIC POWERHOUSE - Magnets strong enough to support 60x their weight, enabling bold, gravity-defying creations.
VIBRANT OVERSIZED - 23 colorful, large pieces designed for little hands to build big ideas with ease and style.
SAFE AWARD WINNING - Sonically welded, non-toxic materials ensure safe playtime with a trusted, award-winning brand.

The SmartMax Start STEM Building Magnetic Discovery Set is a 23-piece, colorful magnetic toy designed for children aged 1 to 10. Featuring magnets that can hold up to 60 times their own weight, this set encourages early STEM learning through hands-on engineering and creativity. Compatible with all SmartMax sets, it offers endless building possibilities with safe, high-quality, sonically welded pieces.

Specifications

ASIN	B071YNVKVZ
Additional Features	Non Toxic
Age Range Description	Baby
Best Sellers Rank	#65,520 in Toys & Games ( See Top 100 in Toys & Games ) #460 in Toy Magnetic Building Sets
Brand Name	SmartMax
Color	Colortpillow-20
Customer Reviews	4.7 4.7 out of 5 stars (265)
Educational Objective	Engineering Skills
Item Dimensions	14.96 x 11.89 x 2.44 inches
Item Weight	2 pounds
Manufacturer	Smart Toys and Games
Manufacturer Part Number	SMX 309US
Manufacturer recommended age	12 months - 7 years
Material Type	Plastic
Model Name	Start
Model Number	102918
Model Year	2021
Number of Pieces	23
Operation Mode	Manual
Set Name	Start
Size	Lumbar Cushion 20
Subject Character	Metal balls & Bars
Target Audience	Kids aged 1-10
Theme	Transportation
Toy Building Block Type	Magnetic Toy Building Block
UPC	847563009640

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