Check the listing for details. DeRoyal LMB MP Flexion Spring (Knuckle Bender). Condition: New. Listed at 69.99 USD. DeRoyal LMB MP Flexion Spring (Knuckle Bender) DeRoyal DeRoyal 701X Dynamically flexes the MP joints No protuding wires or rubber bands Can be worn without restricting hand use Tension may be adjusted. Indications: MP extension tightness or tendency to extend MP joints following wrist fracture. Dynamically flexes the MP joints. No protuding wires or rubber bands. Can be worn without restricting hand use. Tension may be adjusted. Quantity: 1 Size: Small, Medium, or Large Manufacturer: DeRoyal Indications: MP extension tightness or tendency to extend MP joints following wrist fracture. Options: Small (701B) GTIN: 00749756127745 Medium (701C) GTIN: 00749756127752 Large (701D) GTIN: 00749756127769 Sizing Guide: Small: 2 1/4in - 2 3/4in Medium: 2 7/8in - 3 1/4i n Large: 3 3/8in - 3 3/4in