Opening: 5-6MM   All bottle vials are handmade, there is a little difference.

1 tube 35mm flat bottom

2 tube 30mm flat bottom

3 tube 30mm round bottom

4 hourglass 

These are MINI vial  pendant, come with the silver cap or cork You can choose the cap styles up to your need. The cap doesn't have any screw and need to be glued on. You can find the clear glue at any hardware store.

Cap styles for 5mm, 6mm and 8mm vials 

Screw top cap is available too, if you need refill it's a better choice