Wheelchair Cushion 425x410mm Black Sero Pressure Coccyx Cut-out Convoluted Harmony Cover Cushions Pressure Cushions For The Elderly The cushion is also ideal during the natural healing process and relieves pressure points. Foam; Reduces numbness when seated for a long time; Relieves pressure sores; Allows air to circulate and heat to disperse; Made from high quality foam which... The Standard Sero Pressure Cushion has a length of 425mm(16¾), width of 410mm(16¼) and a depth of 75mm(3). Sero Pressure Standard – OT Stores Color may vary(Can not select a color) Reduces numbness when seated for a long time , Relieves pressure sores Putnams Sero Pressure Cushion - Coccyx Therapeutic Seating Product Description The Standard Sero Pressure Cushion from NRS Healthcare has been designed to reduce numbness and relieve pressure sores when seated for a long time. It is made from high quality foam which provides comfort and is also extremely durable. The cushion has pockets which allow air to circulate and heat to disperse.