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 SetMaterial: CopperInoculation Rod Length: Approx. 21cm / 8.3in.Package List:2 x Inoculation Rod2 Bottle x Inoculation Ring2 x Storage Bottle