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. Item Type: Inoculation Rod Set Material: Copper Inoculation Rod Length: Approx. 21cm / 8.3in 2 x Inoculation Rod 2 Bottle x Inoculation Ring 2 x Storage Bottle