Arches Oil Paper is 100% cotton - 300 gsm - 31 cm x 41 cm or 12' x 16' - Cold Press / Fine Grain - Natural White paper. Made on Cylinder mould; acid free, with alkaline reserve; no optical brightening agents; each sheet is watermarked and embossed. Permanent in accordance with ISO 9706; Ideal for oil and oil pastel. Also, for students, professional Plein air artist, Sketches & finished art in oil paints, Glazes & washes in thinned oils, Impasto & knife painting techniques, Multimedia artwork in oils & dry media, Convenient & portable oil painting surface. It has a powerful oil barrier that absorbs water, solvents and binder but allows paints and pigments to sit up on the surface for a vibrant effect and faster drying times