Description: Made of aluminum alloy, lightweight,anti-corrosion and durable. Small and compact, convenient to use. The finger spool is empty and ready for you to add your own choice of line. With a large diameter center hole for comfortable bare hand use and use with cold water drysuit gloves. Great gear equipment for cave diving, technical diving activities and a wide variety of diving applications. Specification: Material: Aluminum alloy Color: Blue Outer Diameter: Approx. 85 mm/3.35 inch Thickness: Approx. 40 mm/1.57 inch Weight:120g Package Includes: 1 Piece Finger Spool Note: Please allow slightly difference due to manual measurement. Color may be slightly different since different monitor. Thanks!