Cabinfever is right FTW (posted that whilst I wuz still peckin' on the keys o.o)
415 chain is what's supplied with the kit - tho it's of substandard quality. If you can find 415 available locally go fer it, no doubt it'd be far better than the "stock" one.
It's a bit confusing for newer folks when looking for other sized chain as a replacement but I'll try and clear that up - 410 is a heavy duty fixed gear bmx bicycle chain (bike shops outa have it) that's slightly smaller (narrower) than stock but many have used it successfully, 41 chain is a heavier (wider) chain than stock and is commonly available at just about any local hardware/farm supply store - I use 41 on my builds. I don't like it a
lot as I think it bulky and overkill, but it's easy to find and cheap at about $12 for a 10 foot roll - far more than you'll need, but nice to have.
While yer there gettin' chain - be sure to grab a spare masterlink and a 1/2 link & a proper chain breaker while yer at it. The chain breakers at Walmart are junk and they can't handle the 415 very well/at all and they sure as heck can't deal with the 41 lol, you may not need the masterlink (with a proper chain breaker) but it's nice to have for emergency repairs, I use a masterlink in my chain even though I've a good chainbreaker for the simple reason that I don't carry that bulky tool with me when I ride. The 1/2 link can help a LOT to get a chain just the right length, these links are pretty long when you consider it's actually two of them that makes a "link" - even with a tensioner you can find yerself with not quite enough/just too much.
Oh right - don't ferget a quality chain lube while yer at it... in case ya don't know, get a "dry" lube (waxy type, dries after application) for a dry environment (street riding) or a "wet" lube (oily, stays wet) for a wet environment (lotsa puddles/off road use). You defo don't need to have both and it's not
that important, it's just the "dry" stuff lasts far longer and doesn't poo all over yer shiny bike, the wet stuff works better but is far more labor intensive as ya gotta clean yer bike alla time and reapply the stuff