These are made for Mavic DJI Pro Drone Batteries. To travel on an aircraft with your drone you will need to cover the battery
terminals from being exposed. They snap onto the battery and take up no more space than the battery itself. They are red in color to keep from
losing them when flying your drone in the field. They were designed by a Mavic Drone user and keeps all his batteries covered with these units.
These are sold in four combination sets. Two Covers $10.00, Four Covers $18.00, Six Covers $25.00, and Ten Covers $40.00