These are a 16 notch with a 44mm OD

High performance for long rides

This will also function as a normal floor pump

comfortable heart rate monitor

G-Form E-Line Knee Guards - L - Storm Replace Images These are a 16 notchE line is a mountain biking knee guard designed for the aggressive MTB rider tackling technical terrain who wants to conquer long days in the saddle. Whether challenging yourself to win a stage of an Enduro, pedal further faster on an E bike, or who wants to Explore new adventures on your moto, G Form believe the demands in knee protection are the same. With a focus on unparalleled fit, next level protection, comfort, and breathability, E line is