Roller: After doing aerobic exercise, you can use the roller to shape the curve of the abdomen to make the body more curvaceous!Product parameters:Product name: Abdominal muscle wheel, Ab Roller,Abs Trainer RollerMaterial:ABS, steel pipe, rubber，EVAPlease check the color and size before purchasing.●All our products are taken in kind. This is a normal chromatic aberration due to the difference between the light and the display when shooting.● Due to different measuring tools and measuring methods, this is the normal data size to have an error of 1 to 3 cm. Begging for forgiveness.Rolling abdominal exercises, increase your physical endurance, strengthen your body!