Featuring a tongue and groove system and easy to fasten system, these hoops are light-weight and easy to use. Made from rigid plastic. No-Slip Hoops have a unique patented feature, a tongue and groove configuration, which holds the fabric securely between the inner and outer rings, thus keeping the fabric in place while working on the project. No-Slip means there is no movement of the project until the outer ring is loosened and the project is removed from the inner ring. This keeps your project taut while you are working on it. Perfect for hand embroidery, hand quilting, punch needle and cross stitch.