For consideration is a pair of small ESS amt tweeters from Performance Series cabinets. Original Heil air motion drivers from ESS of Sacramento, in great condition. They measure 6.2 on my Fluke. Rectangle mount, face dimensions are 3.5 x 4.5 and require a 2.75 x 3.25 opening to install. These are factory PS 820 and PS 920 ESS tweeters, fitment will be exact if these are the cabinet types you intend to use them with. I usually ship within 36 hrs of completed payment. Thank you for looking.