First Aid Concepts FAE-3030 Knuckle Metal Detectable Bandages features a built-in foil for quick metal detection in the event the bandage is lost in a restaurant, food service area, or food production factory. The bright blue also helps identify the bandage. The bandage is constructed out of soft fabric that is comfortable. "H" shape bandage to help maintain finger mobility while being worn on the knuckle. - Blue - Fabric - Sold per box; 20 bandages per box