Behold the horseshoe crab, healer and provider of the holy blood! Horseshoe crabs are important to the medical industry due to their unique, copper-based blue blood.

The patch is 4.5 inches (11.4 cm) long, embroidered, with an iron-on backing. The backing should last for 25 washes. I recommend putting a few stitches in so you don't lose them.