Size: Grip width 30 × Wheel diameter 15 cm Weight: 520 g [Load capacity] 200 KG • Material: Handle: High density, ripstop foam sponge + stainless steel pipe. Roller: Abrasion-resistant EVA with muffling, hub: ABS material • Two-wheel abdominal muscle roller that can train abdominal muscles. Roller adopts ultra-quiet EVA material and has abrasion resistance. • It can be used immediately after assembly. • EVA material rollers may smell a bit when opened, but there is no health impact. Leave it in a well-ventilated place for 1 or 2 days, the smell will disappear.