Our wheel is 3.7” width, while other brands are half that size! This gives you superior stability, allowing unrestricted movement for a more intense workout, They won't wobble holding up to 600 pounds.The ab wheel is made of strong stainless steel. Ensure safety and comfort, silence. Never damage carpet or wood floor.The AB roller kit comes with a resistance band and a knee pad. The resistance band can provide resistance on the way out and a controlled return, the comfortable knee pad can protect your knees from getting hurt.