Hazard 4 AB+ Blood Type Marker 2 Pack OD Green. The 3-d injection-moulded rubber marker is far more durable than the traditional solution since it cannot be wiped off scratched-off or dissolved by most solvents. A more professional choice for a unit or individual operator in its appearance it more importantly prevents mis-reading (imagine B+ becoming B- after some trail-wear). The form-factor allows multiple fast-mounting methods. In keeping with the on-boot tradition weave them into boot laces either horizontally vertically or diagonally (slotted holes allow for different lace-hole spacings). Wear them like/with dog-tags (i.d. medallions) or on a lanyard around the neck. Use paracord to make them into a bracelet. Sew them onto clothing/gear or Velcro backing using the perimiter trench. Or clip them anywhere since they are sold with a durable aluminum black carabiner. They come in sets of two with one clip in a variety of subdued colors and feature a raised guilloche pattern in the background to break up mud/ice. They can even be screwed rivetted grommeted or nailed onto hard surfaces such as plastic cases wooden crates etc. to mark personal gear or a paramedic's blood supply. Also available in glow-in-the-dark. Specify blood-type when buying. Specifications for Hazard 4 A- Blood Type Marker: Manufacturer: Hazard 4 Weight: 1 oz Fabric/Material: Rubber Quantity: 2 Length: 0.9 in 25 mm Application: Around Town Tactical Work Duty Footwear Type: Boots Height: 70 mm 2.75 in Size: One Size Age Group: Adults Width: 0.1 in Seasonal/Temperature Use: All Seasons Design/Pattern: Simi Valley Gender: Unisex Features of Hazard 4 Blood Type Marker Exclusive design/form-factor for multiple mounting options Durable/flexible 3D injection-moulded graphics are always legible Snap-hook carabiner for fast clipping to gear or clothing Fits most footwear with laces or pull-loops Package Contents: Hazard 4 A- Blood Type Marker Hazard 4 PAT-BLD-AB-POS-GRN: AB+ Blood Type Marker 2 Pack OD Green