The Atlantis Raised Toilet Seats RTS are avaiable in 3 height sizes and either with or without a lid. The lid can be used as a bthroom seat. They are lightweight and easy to install. All the parts can all be cleaned with warm water and a neutral cleanser or totally immersed in water. They can also be autoclaved. Total width 36.5cm and total length 40.5cm. Please follow instruction for use.