Reinforced Kraft Paper (also known as poly-craft mask) from Koffler protects your valuable marble, hardwood, tile, and granite surfaces during construction to keep them damage and stain-free. Ordinary kraft paper or rosin paper will tear and let liquid spills through, but the poly coating on our reinforced kraft paper provides a moisture barrier while the filament fiber provides strength from tearing. Simple to use - just roll it out, trim to fit and tape the seams.