Sorbalgon 49210000 Calcium Alginate Dressing Box of 10 Pivot Discs has a threaded seat screw has a threaded seat screw inserts minimize stripping from upholstery changes Armrests and calf pads (if included) are upholstered and padded Carbon steel frame with rust and chip resistant chrome plating Easy to clean navy vinyl upholstery and chart pocket on back Seat size comes in 20 x 18" (51 x 46 cm) Zippered cover with two varying handles Features: Absorbs more than 14 times its weight Forms a hydrophilic gel Holds its form even when wet Easy to remove highly absorbent (absorbs more than 14 times its weight) dressing that quickly forms a hydrophilic gel to protect and cover the wound bed