"State-of-the-Art C-Bond Core Cotton Canvas Panels! These canvases for painting use a state-of-the-art core to allow the panel to be flexible in case it slightly bows due to high or low moisture in the atmosphere. Available in 3 Packs & Boxes of 54 (18 x 3 packs). The elastic core enables artists to flex the board the other way so paintings will not bow over time. In fact, many low-cost wood core panels bow, and this can never be corrected. These panels can always be made to lie flat. These canvases are handsomely crafted with a turned edge. They feature acid-free panel and core, and have two coats of universal Acrylic Gesso Primer, making these canvases a must-have in your painting, drawing and art supplies kit. These 3mm (1/8”) panels C-bond core panels are non-warping, and make sure your art is treasured for longevity. These painting canvases feature 10 Oz double primed cotton.This canvas for painting is ideal for all media applications including Acrylics, Oils with either knives or brushes, color studies and color charts, Plein Aire painting, classrooms, and artists working in humid conditions."