Package include: you will receive 250 pieces 20mm vial rubber stoppers
High quality:self healing port lids is made of high-quality rubber material, reusable and not easy to deform
Size: used for 20mm glass vial and liquid culture jars, fit about 12.5mm diameter opening
Vial rubber stopper: these small vial cap opener may be used to produce injection holes in the lids of liquid glass cans or bottles, test tubes
Wide application: mainly used for mushroom growing and liquid culture production,these port stopper bottles may be used in the kitchen, laboratory, and so forth