Are Spellcasting Focuses inherently magical? [duplicate]

Im having a bit of a quarrel with my DM about if spellcasting focuses are magical. He believes that they are magical since it seems magical to him that you now dont need actual material components since your holding one, but I counter with that no where does it state they are magical and that they are just a conduit for your magical power to come out.

I have looked around on the internet a bit but have found nothing about it, does anyone know a definitive answer to this?