Advanced Materials Soldering Shields come in two materials. Vermiculite Coated Fiberglass or Silica both are the same size (12 inch x 12 inch) and feature (4) grommets in the corners for easy hanging. Both materials are fire resistant that provides a protective barrier between flammable surfaces and open flames when soldering and brazing. Prevent costly fire damage to wood surfaces, wiring, Sheetrock, paint, and other surfaces. Proudly Made in the USA.