This is for the BEN01 Huma Air regulator used by the Hatsan Gladius, BT65, Galatian, Marauder, Armada and Spa M10.  It contains:

A double replacement set of seals for the regulator piston and the set screw.
All external o-rings of your regulator.
A replacement specimum of our special delrin valve disk.
A syringe with our high quality silcone grease to lubricate the internal regulator parts.