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.

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Description

🧱 Build brilliance, block by block—don’t miss out on the future of play!

HASSLE FREE MAINTENANCE - Smooth plastic surface wipes clean in seconds—playtime stays mess-free.
BUILT TO LAST THROUGH PLAY - Durable materials withstand energetic building sessions and toddler handling.
BOOSTS EARLY TEAMWORK SKILLS - Encourages solo and cooperative play, nurturing social and cognitive growth.
FADE RESISTANT VIBRANT COLORS - Keeps its multi-hued brilliance, ensuring your child's creations always pop.
PRECISION CRAFTED FOR PERFECTION - Expertly designed blocks that fit seamlessly for endless creativity.

SMARTMAX Toy Building Block set features 30 interlocking, fade-resistant pieces crafted from durable, easy-to-clean plastic. Sized at 43x35x6 cm and weighing just over 1 kg, it’s designed for children aged 0-5 to develop team-building skills through creative, mess-free play.

Specifications

Product Dimensions	43 x 35 x 5.99 cm; 1.09 kg
Manufacturer recommended age	0 - 5 years
Item model number	SG_B00YHQT7QQ_US
Educational Objective(s)	Team Building Skills
Number of Game Players	1
Number of Puzzle Pieces	30
Assembly Required	No
Batteries Required?	No
Batteries Included?	No
Material Type(s)	Plastic
Color	Multi
ASIN	B00YHQT7QQ

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