100 % PURE COTTON CANVAS - is made from high-grade long-staple cotton. Without rinsed with any alkaline chemicals, it keeps the natural tone and the fiber flexibility of the cotton yarns with high tension strength. When stretching the canvas, high attention is paid to the tight degrees and four wrapped corners to ensure professional and neat products. STRETCHED BARS - are made of high-quality pine wood, each group of which needs to be inspected strictly to check the situation of moisture content, mold, wormhole, and dead knot. The cater-corners and the length of each side will also be checked to ensure the preciseness of the size. TRIPLE PRIMED GESSO - does not crumble or crack. The unique groud coating with patented technique resists the direct touch between the fabrics and oil from paints, extending the life of artwork. High-quality primer keeps the surface excellent pliability and tension either in cold winter or hot summer. Suitable for oil, acrylic, watercolor and other painting media.