https://www.jadesci.com/16mm-Thumb-Caps-For-Culture-Tubes-Orange-1000-cs?quantity=1
16mm Thumb Caps For Culture Tubes, Orange, 1000/cs
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https://rajasenterprises.com/product/tubes-amber-culture-media-round-bottom/
Tubes, Amber Culture Media, Round Bottom - Rajas Enterprises
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https://www.alphalabs.co.uk/laboratory-products/consumables/sample-handling/round-bottom-test-tubes/caps/overfit-caps-13mm-natural-coloured-pack-of-1000-for-resealing-13mm-diameter-culture-tubes
Overfit Caps 13mm Natural coloured pack of 1000 for resealing 13mm Diameter Culture Tubes
Flexible and stretchable, these distinctive 13mm Overfit caps are ideal for resealing 13mm culture tubes quickly and securely. These recyclable overfit caps...