Chrome-edged interior door hinges are made of Zamak, which is an alloy of aluminum, magnesium, and copper, which has a lot of strength and durability, has a chrome finish, and is designed to sit on the inside of doors, holding great weights and achieving fluid opening and closing. Each package contains all 100 pieces that are divided in half between 50 pieces for the left door and 50 pieces for the right door. Its installation is simple and does not require more than screws and a screwdriver to apply pressure.