That's a good question and the answer is....I simply forgot xD I will add it now. Thanks for letting me know.
All the tilesets are 48x48 while the Icons are 32x32 (Just how it works in RPG Maker MV/MZ)
clarification from another pack: the art pixel size is 16x16, and it’s scaled up to work with rpg maker. but on other engines we can use it in original 16x16 resolution!