Air Tank Weight?

Could someone tell me about how much the 3x6 and 3x12 Air Tanks weigh?

P.S. the Clippard website says .2500 for the small one. what units is this?

The clippard tanks from previous KOPs are .96 lbs, and the one from this years KOP is 1.01.

Thanks!:smiley: Are they 2 inch Bore?