Art Essentials Caravaggio Series 501 Carbon Black Primed Artists’ Canvas is an artist quality polycotton canvas, with a medium grain, 75% cotton & 25% polyester and is 330 GSM / 11.5 Oz thick. The polycotton fabric is double primed with a carbon black primer, making it ideal for oil, acrylic, tempera & mixed media painting. The medium texture surface is ideal for all techniques with brush & heavier applications with painting knives.