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 Plus Stem Building Magnetic Discovery Set Ages 1

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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€ 160.27

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Sold byAmazon GERMANYDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧲 Build Big, Think Bigger: STEM fun that sticks with your little innovator!

CURVED CREATIVITY - Includes 4 curved bars to unlock dynamic, imaginative structures
ENDLESS EXPANSION - Compatible with all SmartMax sets for limitless building fun
MAGNETIC POWERHOUSE - Magnets hold up to 60x their weight for epic builds
SAFE AWARD WINNING - Sonically welded, non-toxic materials parents trust
VIBRANT STEM STARTER - 30 colorful, oversized pieces spark creativity and learning

The SmartMax Start Plus is a 30-piece magnetic building set designed for kids aged 1-6, featuring oversized colorful bars and metal balls with magnets 60 times stronger than their weight. This award-winning, non-toxic set includes 4 curved bars to inspire creative STEM learning and is compatible with all SmartMax sets, ensuring endless educational play.

Specifications

ASIN	B00YHQT7QQ
Additional Features	Non Toxic
Age Range Description	Kid
Best Sellers Rank	#53,083 in Toys & Games ( See Top 100 in Toys & Games ) #392 in Toy Magnetic Building Sets
Brand Name	SmartMax
Color	Blue, Green, Purple, Red, Orange, Yellow
Customer Reviews	4.8 4.8 out of 5 stars (226)
Educational Objective	Engineering Skills
Global Trade Identification Number	00847563009657
Indoor Outdoor Usage	Indoor
Item Dimensions	11.8 x 2.4 x 15 inches
Manufacturer	Smart Toys and Games
Manufacturer Part Number	SMX 310US
Manufacturer recommended age	12 months - 5 years
Material Type	Metal, Plastic
Model Name	Start Plus
Model Number	SG_B00YHQT7QQ_US
Number of Pieces	30
Number of Players	1
Operation Mode	Manual
Set Name	Start Plus
Size	Medium
Subject Character	Oversized bars and metal balls
Target Audience	Kids
Theme	Transportation
Toy Building Block Type	Magnetic Toy Building Block
UPC	847563009657

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