Size: 37209cm This superior strengthening wheel helps build and tone your upper abs lower abs obliques arms back and core muscles. Get chiseled shoulders shredded arms and your v-shape back. Wider Wheel for Added Stability: Our wheel is about 3.55'' thick while other brands are half that size! Manufacturered by ZLSP. Comfortable Grips: The curved right and left-Ergonomically cushioned designed handles to minimize hand fatigue while maximizing control to prevent slippage. Soothing Rolling Sound: Abs machine features durable steel coil spring to provides superior resistance (as you roll out) and assistance (as you roll in). And It is very quiet when rotating. FREE KNEE MAT Included so you can use the AB roller on any surface!