Specification: PE blowing seat boards, odorless & non-toxic, Will not cause skin allergies All the Fasteners are stainless steel, will not rust After immersion in water Backrest can be disassembled easy 10-rank height adjustment Big suckers foot pad suck the ground firmly. There are drain holes on the seat board, let out the dirty This Shower Seat has three sections of seat board, with backrest, with side rail.