Nylon spacer blocks designed by us! These give you 1.5" of space between your bar and bag, which is good clearance for mountain bike cables or the top hand position on drop bars. We find these hard plastic spacers are great for handlebars because they're very stable and fairly slim, but the foam ones are still better against your head tube since they're soft (less marring) and squishy (shock absorbing). Our spacer blocks fit any diameter handlebar and are made for 1" wide straps - which you can just push through the center of the block. Injection molded (not 3d printed), so they're very strong!