found at Rusty
Description The Rusty 3.75 Quad Rear Fin Set are designed to reduce drag to maximise speed while increasing control and manoeuvrability. If you are in need for speed then buy now and thank us later. Pair these little fellas with any two outside thruster fins to get the full quad lord experience. Compatible with Future boxes. Spec Fins Height 3.75 (9.51 cm) Base 3.77 (9.58 cm)