Borden & Riley - Denril Mulit-Media Vellum - 3.0 mil Pad - 25 Sheets - 19x24 - The Denril Multi-Media Vellum Pad by Borden & Riley Paper Co. contains 25 sheets of 3.0 mil. vellum that combines the best features of paper and film. This vellum has a very smooth, polypropelene surface. It is waterproof and extremely durable, able to withstand multiple erasings. Denril Multi-Media Vellum has high transparancy and has an identical matte finish on both sides. Try Denril Multi-Media Vellum when you need a high quality, multi-purpose drafting paper.