kölbs gel extreme wheelchair cushions seat cushion, coccyx, sciatica & tailbone pain relief seating pad ideal for office, kitchen wheelchairs and auto, 18 x 18, 3 inch thick (change for dif, sizes) 18x18x3 inch (pack of 1) is up for auction in Health & Household. The current bid is $1.00, 98% below the $47.99 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.