JR39 Arm frames with Memosoft Armpads. 2-way adjustable width/height and removable. Forward-slanting T arms with soft arm pads and natural grip control. Black only. Adjustable height range of 4.25". Adjustable width range of 1.75" each side. 7 year limited warranty on the arm frames and 2 years limited warranty on the arm pads*. **Upgraded version of the JR37M**
This arm does not retrofit.