All of our milk bottle caps are made here in the states (OH) or in Canada. They are made with bpa-free plastic and we have personally spoken with each of the manufacturers to confirm that. Many of the caps are TEC, that is they are Tamper Evident Caps. They have a little plastic strip that needs to be removed prior to use and discarded. All of these caps fit glass milk bottles ONLY. They don't fit the plastic gallon milk jug or any other plastic bottle or jug.
You should hand wash the milk bottle caps, as this will lengthen their life. Eventually the milk bottle caps will stretch and the fit on the bottle will no longer be tight. That is the time to replace them. Never boil the caps as they may shrink.
We sell these caps individually so buy just what you need. Orders of 100 or more qualify for a bulk rate. Often these caps are sent USPS First class mail if that is all that you order. They are very light and fit in a 6 x 10 padded envelope.
To measure for a cap:
Measure the top of the bottle at its opening from outside edge to outside edge. The measurements are listed under each cap on the right.
Regarding the pour spouts:
We recommend only using the pour spouts on the bottle that you are actively using as there is a tiny air hole on the top of the cap that constantly allows air into the milk. It is there to allow the easy flow of the liquid. It is best to use a flat cap on any milk or liquid that is being stored until use.
Also, the pour caps fit tightly on the opening of the bottle. So you need to have strength in your hands to get this cap on and off of the bottle. Once on the red freshness cap comes off easily. So for children and the elderly it makes pour milk easy. So long as there is someone in the home to place and remove the cap on the bottle itself.
Ruth from NY offers this tip for easier on/off for the pour spouts:
"I run the cap under hot water for about 10 secs. The cap pops on or off much easier this way."