The UMF Medical SS8538 Stainless Steel Bassinet with Shelf is built on a heavy duty 1” O.D. (2.54cm) tubular stainless steel framework. Basket supports with insert bends allow basket to be moved to horizontal or elevated positions. Mounted on 3” (7.6cm) ball bearing swivel casters. The UMF Medical SS8538 Stainless Steel Bassinet with Shelf comes with a 3 year limited warranty. Basket and Mattress are optional equipment. Heavy duty tubular stainless steel framework Convenient stainless steel storage shelf 3” (7.6cm) ball bearing swivel casters 3 year limited warranty