Protects allows individual giving injection to use both hands to dispose of the needle
Adhesive barrier bandage is a self-sealing and non-coring membrane and adhesive spacer; provides an opening to allow a needle to make an injection 
Injection barrier bandage helps limit bleeding following an injection; minimizes the risk of blood contacting the specialist 
Round bandages protect both person getting shot and person giving shot
Round bandages act as the form of a target for easy application
Bandages have a diameter of 1-3/8 inches