Feature: 1. Clean and Hygienic: These inoculation rings are fitted with plastic cylindrical tubes to isolate the air and to avoid prolonged exposure to the air, which can cause pollution and compromise use. 2. Sufficient Quantity: You will receive 2 inoculation rods of 21cm in length and a total of 90 interchangeable rings. 3. Chrome Plated Surface: The inoculation rods are made of copper with a chrome plated surface. The chrome layer effectively ensures the copper from oxidation to copper green and is sturdy. 4. Small Size: These inoculation tools are lightweight and small, with a firm one handed grip for fast and efficient handling. 5. Simple to Change: Changing inoculation rings is also very simple, whether in the laboratory or in classroom applications, and the rings with storage tubes are easy to carry. Specification: Item Type: Inoculation Rod Set Material: Copper Inoculation Rod Length: Approx. 21cm / 8.3in. Package List: 2 x Inoculation Rod2 Bottle x Inoculation Ring2 x Storage Bottle