Premium Archival Material: Made from 100 percentage Rag Cotton and made in USA, ensuring long-lasting quality and preservation for your valuable plant specimens Archival Quality: This acid-free and lignin-free unbuffered paper with a PH of 8.5+/- .5, 0.015 inch thickness, are ideal for mounting plants flowers and others Ideal for Museums and Institutions: Designed for the most discerning needs, this archival paper is tailored for use in museums Preferred by Professionals: Trusted by botanists and Herbarium professionals, this mounting paper is the exclusive choice for mounting plant specimens with using neutral PH adhesive, ensuring the integrity of your collection Size: Pack of 50. Each sheet measures 11.5'' x 16.5'', providing ample space for mounting and preserving plant specimens with precision and detail Finest archival quality 100 percentage Rag Herbarium Mounting Paper for Botanists and other Herbarium professionals- use this paper for mounting plant specimens with neutral PH adhesive. This superior paper is off-white with a moderately textured surface for excellent adhesion of mounting strips or adhesive. These 11.5'' x16.5'' sheets are acid-free and lignin-free with a PH of 8.5+/- .5.