The Comfyprene Opposition Thumb Hand (OPH101) provides and adjustable “C” bar support to hold the thumb in opposition. The OPH101 provides gradual extension of the wrist, finger and thumb. Comfyprene Opposition Hand Thumb OrthosisSizeWrist to top of middle fingerTotal Length Adult7” to 8”12 ½” Pediatric Large4 ½” to 6”9 ½” Pediatric Medium3” to 4 ½”8” Pediatric Small2 ½” to 3 ½”7”