Durable and flexible 1/16" thick Vinyl. Slips on and holds tight - no glue required. Covers sharp edges and protects surfaces. Finish off fence posts, furniture, tubing and more. Easy to remove and re-use for other projects. Square Vinyl Plastic Caps are tough yet flexible. These square plastic caps stretch just enough for a perfect fit on square tubing and other square shapes. Our square caps are designed for product protection or quality finishing to square parts.