The Norton Blaze Multi-Air Cyclonic 5" 100 Grit sanding disc (sold in boxes of 50) is a high-performance abrasive designed specifically for hardwood floor sanding using orbital machines equipped with vacuum dust extraction. This disc utilizes P-graded ceramic aluminum oxide abrasive combined with a precision laser-cut spiral vacuum hole design. This "Multi-Air Cyclonic" technology maximizes dust extraction, keeping the work environment cleaner and preventing dust from interfering with the cut. The open-coat grain design and water-based, non-pigmented No-Fil coating resist loading and eliminate color transfer to the workpiece.