Yeah not exactly your traditional slingshot but you hold the pistol gripy part in the middle, the rubber goes on the forky part at the end and the roundy part at the other end rests on your arm. This one was made to break velocity and energy records so it’s big and strong made to support 100lbs+ (45kg) of draw weight, although we tested to forks to 300kgs with no damage (maxed the scale and there started to be scary amounts of energy stored in the system so we stopped there).
Wish I could suggest an exact source but I use mostly doped printer filament. I can suggest though that you want to stick with the SrAl stuff but be careful with some listings because SrAl isn’t available in all the colors that the Zinc sulfide stuff is so I’ve seen listings that have a wide range of colors and list SrAl as the material but only some are SrAl and the others are ZnS. And the green stuff is quite a bit brighter than all the other colors, which again isn’t always obvious from listings since they sometimes brightness balance them to make all the colors appear a similar brightness.
This is actually what I look for. But I‘m afraid shipping to the EU will be extremely expensive. Moreover, I don’t know if customs would clear this material at all. At least SrAl does not seem to be radioactive like those tritium vials.
Convoy - when I bought a selection of o-rings a couple of years ago, the green ones turned out to be GITD:
Kaidomain - the green ones are often GITD or “green fluorescent”, but not all of them say that in the gallery titles or the images, so you have to click through to the detailed product descriptions, and it’s a bit of a lottery, because there are a few “green fluorescent” o-rings out there that aren’t GITD (goodness only knows why):
Got my Lexel board today Will have to buy a kit to flash the FW3A so I can control the leds through the switch (that’ll be a learning curve ). The pink colour is maybe a little bit too dominant for my preference but is otherwise awesome