Vicair Adjuster O2 6 18x18x2.5in 45x45x6cm Wheelchair Cushion.  Like new and was only used for 4 months.  Comes with the User Manual and a 2nd brand new never used cover.  Model/Part# OAD6/4545

Full details are available at:

https://www.vicair.com/products/wheelchair-cushion-vicair-adjuster-o2-6-cm/