All Arches paper is acid-free and made from 100% cotton, ensuring it valiantly stands the test of time and allows you to make the most out of every sheet. An additional protective black cover sheet provides extra protection from light and elements, meaning this paper is made to last for years to come. Arches watercolor paper is available in several formats and sizes including blocks, pads, sheets and rolls, and 3 luxurious textures; hot press, cold press, and rough. Made on a cylinder mold and gelatin sized to the core, repeatedly correct mistakes or use heavy washes while preventing buckling or warping. Being made from 100% natural cotton fiber with no optical brightening agents, Arches paper has an archival, natural white color and an exquisite texture unlike other papers on the market. This lasting, natural white color lends our paper its exceptional beauty while cotton fibers provide astounding strength. The cold press finish has a light texture and is the most common. It reflects light well, retaining the transparent quality of watercolours. A light grain makes it easier to achieve certain details All Arches papers are cylinder mould made as they have been for over a century. With long fibers, this thick, stable sheet is beautiful, durable, and resillient. Each sheet of Arches Watercolour paper is tub-sized in a bath of pure natural gelatin and then air dried to add additional strength and durability The best quality control. Ourt paper undergoes sophisticated testing and monitoring, with every sheet individually inspected to assure the finest quality Contains one block with 20 sheets, 300 GSM