Bio Balls for sale

[teog]

I have tons of bio balls for sale. I have around 15 gallons worth..Will trade for frags or make offer

[Rockfish]

I might be interested in them for my overflows. I was thinking about filling them up with Bi0-Balls to cut down on water rush noise, instead of using a Durso which won't fit in the overflow. The drains are 1.5". What's the diameter of the Bio B's?? Thanks..