These blood group patches are woven machine thread and are very durable when worn on UBACS/Osprey MTP uniform. The blood group patches are velcro backed and are manufactured using crye style multi terrain pattern material, thread colour light brown ( light bronze colour ). We sell these blood group patches as follows A+ A- B+ B- O+ O- AB+ AB- NKA NO PEN. The badges are manufacture by a very reputable UK manufacturer. We have received excellent customer feedback for these badges.