Silver ring with a silver lightning bolt in the center against a black backgrnd

Silver ring with a silver lightning bolt in the center against a black backgrnd - just like with the others there’s no imprint inside the band so I don’t think it’s sterling silver maybe stainless steel but that’s a guess - and size it has to be a 9-10 (just based on lose it was on me and my ring sizes - I received them from a friend who inherited them and didn’t want bc he doesn’t wear jewelry - no guarantees on metal or size sorry