The Twisted Bouncer 19/16 Landing Skid is made of the very resilient NinjaFlex thermoplastic polyurethane (TPU) and mounts below your motors with 19mm/16mm bolt spacings. This should cover 2204/2206/2208 motors and if you are willing to just use two screws it will work on 16/12 motors as well. Due to the nature of landing gear you may expect that we would not honor our No BS 3D Print Promise, we want to assure you that we are so confident in the durability of these gear that we will still be offering the no BS promise! Note: Do not attempt to pull these apart – use a sharp knife or other good cutting impliment. The NinjaFlex is stronger than you think. Caution: Landing gear added to some frames may alter structural integrity in the event of a “belly flop” landing. This is an unfortunate side effect of any landing gear and should be considered before adding these to your craft.