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, Shrink Wrapped Rolls.