"In general, magic items are used in the same way as before, except that many items will be much more powerful. When such items have the effect of spells whose effects change with level, consider the power of the item to be as a 6th level spell caster." (emphasis mine)
Page X51 of the Expert Rulebook says that clerics, magic-users and elves can attempt to make magic items "On reaching name level" which is 9th level.
Where do these 6th level magic items come from?