This design provides extension to the PIP and a mild extension effect to the MCP. Leaves the DIP completely free. The pressure is distributed by the dorsal pad. The spring can be adjusted individually. 
The force is approx. 2,3 N in 15 degrees of flexion.

Length & width in mm. The distance is measured from the distal flexor crease in the volar to the flexor crease on the DIP joint of the finger. The finger should be extended during the measurement.