Sia Siaair 7940 Velvet Sanding Disc Box of 10 150mm Polishing BackingThe improved siaair technology of 7940 siaair is the key to a perfect nish in damp and dry sanding applications – whether it's scuf ng, ne sanding or preparation for polishing. AdvantagesHigh stock removal rates and excellent finishLow clogging in damp and dry sanding applicationsHighly adaptable to contours, curves and profillesPressure-equalising foam gives perfect surface nishWaterproof and washableResistant to silicon remover