4x4 Speed Cube with Fast Turn & Adjustable Tension - Smooth touch and good corners cutting to facilitate quicker twist and smooth rotation. The tension of magic cube can be adjusted be better accomodate individual needs. Handy size and lightweight, perfectly fits into hands and easily portable. SMOOTH AND FAST TURNING - With rounded corners to ensure good fault tolerance, you can turn easier without jam when it's slightly off centered, but no need to worry about falling apart. It has very smooth surface, no burr, which makes it more slippery and speedy to turn, with this cube you can against the word record of 4.90 second with aid of enclosed English sulution guide Educational Puzzle Toy - A very interesting cube puzzle to exercise logical thinking, brain & hand coordination; improve patience and concentration. Gain great fun by twisting and solving the puzzles games. DURABLE AND BRIGHT COLORS - Crafted with eco-friendly ABS material, non-toxic and no peculiar smell, stickers material is superior PVC with a smooth glossy finish and bright colors. Meanwhile the stickers is very durable and waterproof, the colors won't fading even you play it every day, and won't broken when you drop it ULTIMATE GIFT IDEA - The Speed Cube is a fun, inexpensive, and unique gift for everyone. It can also keep Mom and Dad in quick-wittedness against Alzheimer's. You can get a memory jog with this cube. Classics that never go out of style