Look for "vase filler glass beads". This is not vaping stuff, they are used for a lot of applications.
Here is one from Amazon
They look like orbeez or whatever, little polymer balls that swell with water and greatly expand in size. Actually would be an interesting addition to a vape piece.
Google says they are "made of acrylic acid, sodium hydroxide and water, to which color pigmentation is added to give more variety of nuances. It is the water molecules that make Orbeez grow."
The Canadian Winter is using solid beads of borosilicate.
You can get glass marbles or glass pebbles used for supporting flowers in a vase, these will be soda lime glass, but functionally similar enough.
A while back 'diffuser beads' were a packaged accesory for glass bongs, but that search term has also been compromised by the existence of the polymer balls too, where they're used to absorb essential oils to slowly release fragrance.
A bunch of small gemstones would be a neat alternative
I’m super interested in this. Do you have a link to the appropriate one? Google brings up at least 1,789,200 results. Much appreciated my friend!
I recommend the Xtar MC2 for the following reasons:
- closely matches specs to the mains/DC efest option that HL linked to before the magnetic charger was in full swing
- uses USB Micro-B for power rather than a DC jack, allowing portable use (battery bank) and simple international adaptability
- fits the Hopper batteries extremely well without any mucking around
- will not overcharge the Hopper battery, even if left on the charger. It sends a magnitude less current to a charged cell than the more expensive, less suited, Nitecore models. Leaving charged cells on charge for many hours isn't a huge problem with the Xtar MC2, which is a nice peace of mind for easy care-free charging
- it's really small and portable, which goes well with the Hopper kit. Especially if considering single cell charging with the Xtar MC1
note that these are all older models, and the newer Xtar MC2 Plus design will fast charge the GHBs because of their length. Due to the low capacity, a less intense curve will offer more cycles and is the way to go. ~1.25hrs to charge.
If you don't already have a cylindrical Li-ion charger, and only need a 2-bay (or a Hopper charger), then the MC2 is perfect - extremely high quality and the value is next to none.
Unfortunately it's getting harder to find the older models as they are getting bought up and probably aren't in production any more.
here is the single bay ultra portable MC1:
https://www.banggood.com/XTAR-MC1-18650-14500-26650-Battery-Micro-USB-Smart-Charger-p-954099.html under $10 USD
MC2 is sort of a drop ship type item at this point, but they can still be found for 6-20 bucks
https://www.amazon.com/XTAR-MC2-Charger-Black/dp/B00MS4U5BU
. My stuff is made of glass, It's just the way they called them at Planetvape. I've put them in water a lot of times and they never grew in size, unless I was too medicated to notice? 
So hopefully I do a lot less damage with the MC2 haha. Thanks for the info dude!