I have a 15 pound roto grip critical theory and 15 pound track 919c that I'm looking to sell. Both balls are single drilled for a lefty with a cut to cut span of 4 x 4 1/16. They both have grips and a switch grip outer sleeve.

The critical is drilled with the pin under ring and has a small weight hole. 919C has the pin over ring and a small weight hole. The 919c is lightly scribed. Both balls have 5-10 games on them at most and have been cleaned and maintained well after every use. The covers are excellent on both. 

Asking $55 + shipping for the 919c, $60 + shipping for the critical theory, and $110 + shipping for the pair. Shipping will be from 11758... I usually get a decent price via UPS so it won't be too much, especially if you're on the east coast. Prices aren't firm so send offers if you're interested. Message me with any questions and pic requests.