The Align-Pilates Frame Sitting Box is a little smaller than our Sitting Box making it the ideal length for smaller reformer carriages for example, the earlier C-Series, F-Series, and H-Series reformers. The Frame Sitting Box not only makes new exercises possible on your Pilates reformer, but it makes seated and prone exercises more comfortable. Made with EVA foam padding with abrasion resistant vinyl cover weighing approximately 15lbs or 7kg, its lightweight and easy to manoeuvre with the open sides style. Suitable for use on all Pilates reformers brands.