Quantity of (4) rolls: Grace # 45639 Grace, 4" x 75', Vycor Deck Protector. Features A Unique Adhesive & Membrane Composition For Providing Corrosion Protection Prevents Water Infiltration At Deck Fasteners Skid Resistant Coating For Easier Foot Traffic During Installation Compatible With All Decking Materials, Between The Connector & The Pressure Treated Wood & Acts As A Barrier Layer To Break The Electric Circuit & Helps Reduce Corrosion Pack of 4 rolls Grace # 45639 Grace, 4" x 75', Vycor Deck Protector.