The stylus tether is designed to work with the Surface Pen 1st and 2nd gen. It features a strong bungee like cable that secures the Surface Pen to any aXtion case. The tether is paired with a 3M stylus holder for cases without a built-in holder. The holder features an elastic loop, which holds the stylus when not in use. Simply attach the 3M side down onto a non-porous hard plastic case.