Quadtro Select Wheelchair Cushion 20 x 18 x 4.25 Roho Cushions Covers Heavy duty vinyl with Permablok 3(R) Underpads Heavy duty vinyl with Permablok 3(R) bacterial protection * 1´ Firm density foam tops * Radiused seamless corners on upholstered components * Top sections have welded steel support frames * Pivoting joints house hardened steel shoulder bolts with locking nuts to ensure years of trouble free operation * Footswitch control * Power assisted caster system (unless noted otherwise) * 110 volts 60Hz motor (220 volts 50 Hz available on special order) * 500 lb Reclining shower chair w deluxe elongated open front commode seat footrest padded elevated leg extension & lumbar support * 3 year limited warranty