FUN FOR ALL AGES - Great brain teaser for the kids and a stress reliever for the adults after a long day. Promotes problem solving skills, eye-hand coordination, and cognitive thinking. | SMOOTH PLAY - This 3x3x3 brain teaser cube is ready to play without any tuning. At the same time you can adjust the tension to your specific needs with a screw driver. | FASTER TURNING - Great corner cutting for advanced play. | ECO- FRIENDLY MATERIAL - Made with non-toxic ABS material with long lasting vivid colors. | RISK FREE, FULL MONEY BACK GUARANTEE - If you don’t like our cubes for any reason. We will replace or issue a full refund. However, we strongly believe in the quality of our products and we are so certain that you will love our product.