Red Urchin Roof Guards for Metal Roofs. Can be mounted with the following optional methods: Adhesive, 3M PeelnStick, or Screws. Hardware is not included. Fits most metal panels with a 1.5-inch flat area. Starter points are provided for mechanically fastening. The base is waffled for adhesive mounting. Made out of ABS Plastic, strong and rigid to last the harsh winger. Helps minimize damage from sliding snow and ice by breaking it up into harmless-sized pieces. Aesthetically pleasing shaped snow guard design. Like jewelry on your metal roof!