Fits standard bushes and supports to extend life, increase stiffness, and improve overall performance. Polyurethane inserts provide stronger, longerlasting bushings that outperform factory rubber bushings. A pair of arm inserts upgrades the factory dog bone mount to reduce excessive motor vibrations. Replaces factory rubber bushings in dog bone mounts to reduce wheel hop and traction loss, delivering more effective power transfer to the wheels. Key attributes Function: Upgrades dog bone mount with polyurethane inserts for reduced vibration, improved stiffness, and better power delivery. Material: Polyurethane inserts designed for durability and longer service life. Compatibility: Designed to factory rubber bushings in standard dog bone mounts. Performance: Enhanced stiffness, reduced vibration, extended component life, and improved traction. Use scenarios torque RC racing or drag runs: minimizes wheel hop and motor vibrations for more consistent acceleration and traction. Rough or offroad driving: reduces wear on bushings and maintains stable power delivery on uneven surfaces. Frequent bushing maintenance or upgrades: provides a longerlasting alternative to factory rubber bushings with noticeable performance gains.