SHOCK-WBV C Series Seat Suspension for Helm Chairs Spring Shock Absorber - DNM Black [85.19]C Series Seat Suspension for Helm Chairs Spring Shock Absorber DNM Black WBV is a seat suspension system specifically designed to reduce shock and vibration caused by wave impacts. WBV suspension units are designed, tested, and manufactured by Sea Sure Ltd, a world renowned high performance maritime and aerospace manufacturer. Our range of suspension units caters to all seat chair types and can be easily retrofitted to make your day on the water