They come pre-loaded in sterile needle injectors.

https://image.nostr.build/dd7970a3a92ef632940b70b49210cb5f13827e9a1e44728b863a0e70650c27c0.jpg 

 That's weird. Interesting though I guess.  

 I'm weird. It's ok.

https://image.nostr.build/904f3c33d9b7ff07d93502ab5979c7fd5d6e9895cef565f299cb263e5052ab0a.jpg