Hu-Friedy's cutting inserts cut distal wire flush to the buccal tube or bracket while the blue ring grasps the cut wire until released. The enhanced design reduces debondings and improves patient comfort. Designed for all types of wire up to a maximum of .021" x .025" (.53 mm x .64 mm). Package includes 10 blue silicon rings. Replacement rings available in 50 pack (678-114R50) or 150 pack (678-114R150)