This is a set of four (4) spring pads that fit into the ends of the rear suspension coil springs and help minimize NVH (noise, vibration, harshness) that originate from the suspension and migrate through the chassis and into the cockpit.  This set of pads are made from polyurethane, which is far more durable than the original rubber compound.  Suitable for all Triumph TR4A (IRS) TR250 TR5 and TR6.