WHAT IT ISOne Extra Protective Rim Strip, two valves, and an installation/removal lever tool for replacing or refreshing the Protective Rim Strip on your M Series 730, 735 or 930 wheelset (Not compatible with any other M Series mountain wheels).WHY WE MADE ITThe Protective Rim Strip is made of a specially formulated material that acts as a durable bumper between unforgiving obstacles in the trail and your carbon fiber wheel protecting the rim from damage and tire from pinch flats Similarly, the strip provides a complete seal for the tire on the rim, eliminating the need for tape, and is mandatory for use with M7 and M9 Series wheels.