were are they from?
i think there genertaed by runescape or bought
Some shops sell black items. Also some monsters drop them.
dont know if this will help, but you can get the black full helm and legs in the champions guild, not sure about the legs… you can buy the black plate in the plate store in varrock. The black medium helm u get from those black worriors?, forgot what their called, but u fight them in the black something fortress in like 10 wildy(im horrible with names right now, im in the library at my school! lol. black square shields u get from moss giants, and black kites u get from ice giants. Thats all the black stuff that i can think of right now, hope it helped!