Excellent quality and rubber cover: The wheel is made of sturdy material. Make sure it is safe comfortable and quiet. Do not damage the carpet or the wooden floor. Portable and easy to use: Easy to assemble quick assembly and disassembly and no pressure. This lightweight belly wheel plus box weighs only 1.5 pounds. Manufacturered by ZLSP. Core training: Each time you repeat the first exercise it will act on the abdominal muscles hip flexors shoulders and back muscles. Not only does it help increase your waist strength it also reduces the risk of muscle injury. Our abdominal exercise bikes are small and easy to carry around. Wide Wheel: Our wheels provide you with excellent stability and unlimited movement for more intense workouts. They don't shake no more than 450 pounds.