The Spare Power Replacement Kit [SPRK] designed to provide a compact and durable way to carry spare batteries for your optics, flashlights and other accessories. The included bit slot gives you a backup solution for emergency repairs in the field. Similar in size to a compact double stack mag making it easy to stash in a range bag, pack, chestrig, GP or pistol mag pouch.  Featured storage1x 18650 or 2x CR123a 2x CR2032/1632 2x Hex bit & included bit driver slot. Product info: 1.2”W x 2.8”HMaterial: PLA Type of 3D printing: FDM (Fusion Deposition Modeling)They are 100% solid PLA Plastic