The coil springs of the Rolyan Sof-Stretch Long Coil Extension Splint assist PIP and DIP joints into full extension. The splint is ideal for helping reduce tightness from flexor tendon and volar joint, and soft tissue tightness. It is best suited for contractures up to 45° that feel elastic when stretched. Contoured proximal and distal pads distribute pressure evenly.For size, with finger straight, measure corresponding finger on unaffected hand from distal palmar crease to middle of distal phalanx.