Amazon.com: Plastic Screw Caps for PET Bottle, 28mm, bag ...
It worked great after finding the right bottles that worked for these caps. I would recommend 2 different bottles that worked very well. The first was SMART water, and the second was Pellegrino (the plastic bottles of course, not glass). Delivery was fast. Packaging was a small plastic bag with all the caps, delivered in a typical amazon box.
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