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Our 100% cotton fiber vellum is transparentized using a proprietary process without volatile organic compounds and has a bright white finish for strong visual contrast. We offer both a medium weight (17lb.) and a heavy weight (20lb.) to meet any application requirements. In addition, sheets are corner notched for convenient processing. Thru-put® Vellum meets Federal Specifications UU-P-561H for Type lV and are archivable.