Lighten up with our all new Micro Wheel Collars. Designed for electric flyers with .047� to .062� axles and use set screws for a secure fit. These Micro Wheel Collars are 50% LIGHTER than standard 1/16� brass wheel collars. Each collar weighs 0.42 grams. Each pack includes (4) collars with set screws and a .050� allen wrench.