The Art Board Canvas Flat Panel 16x20 Inches features a rigid, warp-resistant backing board meticulously wrapped in a 100% natural cotton surface that completely eliminates sagging. This space-saving, lightweight panel arrives triple-primed with an acid-free acrylic gesso layer, making it immediately ready for detailed oil sketches and fluid acrylic painting. Measuring 406mm x 508mm, its slim, highly portable profile fits perfectly into standard pre-made picture frames and is an excellent choice for outdoor plein-air painters and students.