Vibration Damper:SW55SS BJ55 This is the Pro Boat Vibration Dampener Set for the ShockWave 55 Super Sport and Blackjack 55.Features:Black and grey coloredMade of durable materialFor the Pro Boat ShockWave 55 Super Sport and Blackjack 55Includes:One Pro Boat Vibration Dampener Set, (4)Requires:Installation onto boat