Our 18650 battery holder is made of high-quality material which can use for a long time. This battery holder is equipped with connected leads, which can be connected in series. it is essential for physics teaching. Features -Color:Black. -Material:Plastic, copper, -Size: About7.60X2.10X2.00cm/2.99X0.83X0.79in. - Our 18650 battery case holder with leads, the black and red two wire design is great for easily soldering and connecting. -The battery case holder is designed with a high-quality spring fit for most kinds of batteries. -Made of plastic and copper material, lightweight, convenient to carry, for keeping the battery in place. -Great items for keeping your standard batteries together and safe. -Wire lead battery case holder for 18650 single battery, perfect for physics teaching equipment.