they look better than the ones groceries stores would sell around me calling them low tier in everything would but price wouldnt be exagerating lol. most were barely a step up from a sparkler. though you gotta drive to a different state and a fireworks specific store to get the good stuff here, maybe places with more lax laws on them would have the good stuff everywhere, he might bust out something that'd make joe dirt shed tears xD
well they're prolly stuff like sparklers and something on a small scale that an adult can legally get as opposed to the huger ones you see during all those festivals
but with magic i wouldn't be surprised if this isekai world had some mage-created shaping various patterns of fireworks