Product Description: Features: 1. 100% brand new and high quality. 2. There are card slots on the edge, which can be sewn freely. 3. This product is small in size, easy to store. 4. 50pcs in total, sufficient quantity. 5. Suitable for 18650 lithium ion battery. Specification: Material: ABS Plastic. Size: approx. 42 x 22mm/ 1.6" x 0.8" (L*W). Inner Diameter: approx. 18.4mm . Color: Black. Please note, installation requires top and bottom piece to work.. Note: Please allow 1-5mm deviation due to manual measurement. Package Included: 50pcs x 18650 Battery Holder.