This listing is for a vintage pair of Utah H-458 horn tweeters, rmoved from a pair of HS1-C speakers I have parted out. These are 16 ohm tweeters. 

 Both have been tested with music & a multi meter & are in very good working & cosmetic condition from their age (circa 1970). 

The measure 3 1/2" by 8". DCR = 9.7 & 10.4.