And where can I get it?

If that’s numbers from the back of some soccer-jerseys then they are probably custom. See FAQ #16 regarding sports teams logos (and custom fonts which has to be added).

I don’t think they are custom - you can get them from several different heat transfer companies online - but each company calls it something different and I’d like to get the letters that go with them...

Katee - Proportionally, these numbers look a lot like FB Interstate but there’s no Inline version of it. Perhaps you can find an Inline sans serif that would work with these numbers.