Material : Made of high-quality engineering plastics, simple design, beautiful appearance, sturdiness and durability. Have excellent impact resistance. the handle is padded with EVA foam for added comfort; high-quality rubber wide wheels are more durable and safer, more stable, does not hurt the floor, more silent. Ultra Wide Abs Roller Are More Stable：Our exercise wheel are 4 inch wide, while other brand wheels are only half as wide! Ab roller for abdominal exercise gives you excellent stabilit