STIFFIE AirBlock Green/Black 3" Alpha-Numeric Registration Identification Numbers Stickers Decals for Boats & Personal Watercraft All STIFFIE styles measures in at 3 in height and meet USCG requirements when installed per instruction. All STIFFIE kits include 4 each of the letters A-Z and the numbers 0-9 for a total of 146 decals. All STIFFIE kits resist damage due to fuel spillage, chemical deterioration, fading, scratching and curling. All STIFFIE Alpha Numeric decals are finished with a UV Clear Coating to protect your decals from harmful Ultra Violet rays. STIFFIE uses 100% LEAD-FREE ink and marine grade vinyl. All STIFFIE decal products are environmentally safe and friendly. Application is easy; just peel away the decals from their backing and apply. All STIFFIE decals incorporate permanent waterproof adhesive.