The 35-degree slope fits the user's arm angle and protects wrists. Considering the length of the human arm and the angle of a litter box, the concentrated surface design is more comfortable for users' wrists. The configuration of small holes in front and big holes behind separates crumbs precisely with its 8-shaped holes, saving 5% clean litter back to the box. It improves cleaning efficiency. We can save time and spend time on something more important.