The capper has a matte texture, fine iron forging, never deformation,to prevent rust, , easy to carryCompliance with medical research and production needsMovement secret agents, not least bit of difference, caps pressed after smooth and complete,good sealingComfortable, adjustable elastic, smooth and health, beauty smart,safe and reliableWidly used in medicine, lab, hospital and school and other our .color: Blackmaterial: metalNumber of items: 1Package Contents:1 x CrimperOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.