Baidecor Plastics Cylinder Cube Puzzle 3 Layers Size: 2" x 2" x 2" - Material: ABS Plastics. Non-toxic, lightweight. Difficulty level: medium. Great choice for both beginners and cube game fans. You will become the focus when you play this special cube puzzle, get relaxed when you were boring or flying. Feature: fully functional spring structured for fast turn. Cube puzzle exercises memory and hands-on skills, perfect educational games.