The sensational primaflex system allows you to insert the ear tags quickly without causing harm to the animal simply place the tag into the pliers and press them closed over the animals ear to insert he tag the special spring mechanism in the forceps causes immediate triggering of the ear tag easy and fast marking with wear resistant lettering features red colour two sided numbered or blank 25 pieces packonly available in packs 1 25 26 50 51 75 dimensions size 2 6