
Cool. I like both sizes very much, although with a larger set you get a little more for your money. My project is to make one big tetrahedron out of 120 smaller ones. It's easy to do with magnetic sticks and non-magnetized balls. I wish they had 10 colors instead of 9, but that wouldn't matter for most projects.

STEM Robotics For Kids: PANLOS 655 PCS Military Vehicle Building Blocks Set For Ages 4-8
30 Review

PANLOS Robot Building Kit - 723 Pieces Of STEM Learning Fun For Kids
11 Review

STEM Learning Building Bricks Toys - 832 PCS 8-In-1 Robot Building Kit For Kids, Including Armored Police Car Engineering Construction Vehicle Blocks Set, Ideal For Boys & Girls Age 4-8
14 Review

655 PCS STEM Robot Building Toy Set - 6-In-1 Fire Truck Kit For Kids Age 4-8
19 Review