The 115gsm (4oz) traditional medium texture weave cotton used on these Premium Cotton Canvas Boards is suitable for oil and acrylic painting - from thin washes to thick impasto marks, and is universally primed to 240gsm (7oz) to protect the natural fibres of the cotton. Each board is 4mm thick and extremely rigid, with the canvas wrapped around the edges and glued to compressed cardboard. This is a single Premium Cotton Canvas Art Board, 4mm, 16x16in (40x40cm)