Traxxas 5116A Ball bearing 5x11x4mm Black Rubber Sealed (2

Traxxas 5116A - Ballbearing 5x11x4mm - Black Rubber Seal (2) 5116A with Black seal: Rubber seal in full contact with the inner ball race More rotational resistance Less maintenance needed 5116 with Blue seal: Rubber seal not in contact with the inner ball race Less rotational resistance More maintenance needed