... high quality canvas permanently protected with acid free and primary suitable for oil and acrylic painted2) Style: Nails on side, staples on ... , 1.8 x 3.8cm, 3.8 x 3.8cm, and 7.6 x 3.8cm (3/4", 1 - 1/2 ... " and 3"), different thickness and shape frames are available5) Shape: Quadrangle, round, oval, triangle, hexagon6) Customized color label is available kids canvas painting set