1 dram (1/8 ounce, 3.75 ml) glass vials. Standard black cap closure with polyethylene foam general purpose liner. Not really an airtight seal but is generally leak resistant.
We use these for dry stuff like dirt, powder, seeds, and herbs but these are also great for beads, a little pinch of small diameter resin incense, or any other tiny thing that would be happier in a little glass bottle.
Neck size 13-425
About 1.75" tall and 0.5" wide (15mm = x 45mm) with a mouth opening just a tick over 0.25".