cturnbullhttps://tritiumkeychains.com/shop/You’ll need to determine what size (length) you need first. Then choose your colors. I’ve ordered from the site above for a spinner I have.
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Don't forget that you need UV clear resin and a UV light to cure it. Instructions can be found online. Don’t use anything like super glue or you might ruin the trits and your flashlight.
cturnbullmixglo.com is where I get mine from.
Just be sure to pick up some Norland 61 for mounting them. I've seen it available on most tritium sites, and I picked some up on ebay before.