Sturdy and versatile, the Cube was designed for suspension and traction training with close-knit hands. The result: Strengthened fingers, deltoids and chest area. The Cube has 4 different grips (4 fingers in 25mm, 3 fingers in 35mm, two-finger and mono in 40mm+ handle). The versatility makes it a great tool for diversifying finger strengthening exercises. Made from recycled rubber wood, the Cube offers a soft-touch surface.