The Align Pilates Leg Extensions For C Series Reformer features a 4-leg extension to raise the height of the Align-Pilates C*-Pro Pilates reformers (including the C1-Pro and C2-Pro) from 24cm to 42cm. In addition to raising the height of the Pilates reformer to the more popular 42cm height, the leg extensions allow the C*-Pro reformer's to free stand which can be very convenient in mixed-function Pilates Studios or health clubs. This will make a lot of difference for you especially if you suffer from a bad back or difficulty in getting up from the floor. This set of 4 leg extensions are direct from the manufacturer and are designed for the C Series 1-Pro and C1R, C2Pro reformers. They are not compatible with the original C1 reformer. Has the added bonus of now allowing your C2 Pro to vertically stand without the use of a wall to lean on.