Vicair Adjuster O2 10 18x20x4in 45x50x10cm Wheelchair Cushion.  Like new and was only used for 4 months.  Comes in original box with a 2nd brand new never used cover.  Model/Part# OAD10/4550 OADS-1820

Full details are available at:

https://www.vicair.com/products/wheelchair-cushion-vicair-adjuster-o2-10-cm/