Aries Laser Designs JP-4 Slug Plug Engraved with Spartan Helmet; Fits Gen 1-3 Glock Pistols; Model 21 SF ONLY Spartan Helmet engraved in subdued pattern, unique item JP-4 Slug Plug Fits Generation 1-3 Glocks Fits Model 21 SF ONLY Special black polymer material, prevents dust, debris, rain, and other elements from entering your gun NOTE: You are getting a SUBDUED engraving. THIS MEANS THERE IS ABSOLUTELY NO COLOR IN THE ENGRAVING. IT IS PRINTED INTO THE BLACK PLASTIC PLUG. BUYER WILL BE FULLY AWARE OF THIS WHEN PURCHASING. NO COLOR. NONE.