The Pololu 3/8” Plastic Ball Caster is a sturdy, low-profile, omni-directional caster that is perfect for use with 3/8” Actobotics components. It features a durable plastic wheel and a lightweight plastic body, making it ideal for applications requiring low-force pushing or pulling. The 3/8” diameter plastic wheel has smooth motion and rolls in any direction, yet is still strong enough to hold up in rough conditions. In addition, its round pull-through design make installation and removal easy.