Playwin Cailun New 5X5X5 Speed Cube Puzzle Black Adopting reliable plastic, it is non-toxic and lightweight. For kids, it can develop their brain and logic thinking ability, this would be a great gift for your kids For adults, it can release their pressure after work. Solving puzzles and brain teasers are important activities to teach kids to work hard at solving complex problems and foster your kid's sense of space and enhance a child's memory. Packing of one 5x5x5 Rubik's Cube and a cube bag.