EmbTao Type O Positive Tactical Blood Type Fastener Hook&Loop Patch - Black & Red - 2"x1" Fastener hook backing for attachment to tactical hats and gear. The loop tape comes for free. Measures 2 inches wide by 1 inches tall. 100% fully embroidery. Safe & non-toxic. Washable and Durability. EmbTao is the top embroidery brand for best patch. Perfect for Jeans, Jackets, Vests, Hats, Backpacks and more!