Ultimate Arms Gear 5.56 Caliber Black & White Laser Engraved Aluminum Custom Protect Rail, Large, USA MADE Made In The USA. Laser Engraved Aluminum Are Made of High Strength, Abrasion and Solvent Resistant Thermoplastic Bonded with A Hardcoat Anodized, Laser Engraved Aluminum Insert. The Anodization Process Prevents The Image From Chipping, Cracking or Peeling. They Are Secured Using Two Side Tension Screws that Apply Pressure to Two Locking Tabs. There Is Absolutely No Metal to Metal Contact, This Prevents Heat Transference and Damage. They Measure 1 3/8" x 2 3/4" (35mm x 70mm) and Weigh about 17 grams. The Patented Snap On/Slide On Clamp Allows You To Easily Place Your Protect Anywhere. Designed for Placement Flexibility, Minimum Obstruction and Unparalleled Durability.