... price 3. Good quality Core Barrel(Split Tube): we can do any size of split tube for any core barrel.We are ... % + core recovery in the most difficult formations.Size available:Q series Core Barresls: AQ, BQ, NQ, HQ, PQ, NQ3, HQ3T ... series Core Barrels: T2-56, T2-66, T2-76,T2-86, T2-101, T6-131 T Series Core Barrel (Split Tube)