Plexist&reg; 12 Colors Pentagon Professional Megaminx Brain Teaser Speed Twisty Puzzle Toy Black Game Education Creative Magic Cube (12 Different Colors) Black magic cube Material: high quality ABS plastic and long lasting PVC sticker For kids, it can develop their brain and logic thinking ability. For adults, it can release their pressure after work. Small dynamic and static friction coefficient ensures safe, Special shape of puzzle provides hours of fun time; High-quality adjustable spring, smooth and comfortable rotation; Extremely fast with excellent cornering. The interface is smooth and each corner has a chamfer.