Features QUANTITY AND SIZE: You will receive a 23cm inoculation stick with a total of 40 replaceable inoculation rings with a diameter of 5mm; Sufficient quantity and model to meet your requirements DURABLE MATERIAL: The inoculation rod is made of chrome plated copper. The chrome plated layer can effectively protect the copper from being oxidized into patina. Replace the inoculation ring with chrome wire material, durable PREVENT POLLUTION TUBES: These inoculation rings are fitted with plastic cylindrical tubes to isolate the air and avoid long term exposure to air, which can cause pollution and affect use COMPACT AND PORTABLE: The inoculation stick weighs about 10g, so that does not need to bear too much weight when used; Light weight, small size, one hand hold firmly, fast and efficient operation PERFECT REPLACEMENT: Replacing vaccination ring is also very simple, whether in laboratory or classroom applications, with storage tubes for easy placement Specification: Item Type: Inoculating Loop Kit Material: Copper Inoculation Loop Length: Approx. 23cm / 9.1in Inoculation Ring Diameter: Approx. 5mm / 0.2in Inoculation Loop Weight: 10 g / 0.4 oz(approx.) Package List:1 x Laboratory Inoculation Look1 Bottle of Laboratory Inoculation Ring1 x Storage Bottle Package List 1 x Laboratory Inoculation Look 1 Bottle of Laboratory Inoculation Ring 1 x Storage Bottle