In addition to the 6" Pyrex suspension previously posted, another JSIC collector walked in with a stringer of "tweener" sized Pyrex suspensions (pictured here with the 6" unit). I estimate these at approximately 9" in diameter... definitely smaller than your typical "sombrero" Pyrex suspensions. This is the one and only time I've ever seen these smaller sized Pyrex discs. For a quiet little winter JSIC swap, some neat stuff walked in the door!