HIGH QUALITY AND ENVIRONMENTAL PROTECTION: The corner protector is made of high quality cardboard, environmentally friendly and fine workmanship, with a buckle, three-sided right angle after folding, which can prevent collision and absorb some impact force. Safety Protection: The edge protector is light and strong, well designed and easy to assemble. Essential for the safe transportation and storage of artworks, easy to remove and reuse, the materials used can be recycled after treatment, making it the most cost-effective way of protecting artworks. QUICK AND EASY TO ASSEMBLE: The corner protectors are supplied flat and can be easily folded along the lines into the desired shape before attaching to the corners of the frame. VERSATILE USES: This cardboard shipping protector with movable corner protectors is suitable for protecting canvas, photo album, picture frame, mirror and other similar sized items. Ideal for packing, shipping, storage and moving. PACKAGE INCLUDED: The package includes 20 pieces of adjustable cardboard frame protectors. If you have any questions about the product, please contact us first.