Prima-Max is Maxtreme's triple-ester trenbolone: one 10 ml vial at 150 mg/ml, the total divided between a fast acetate and two slower esters of the very same hormone.
Trenbolone is a 19-nortestosterone derivative that is not a substrate for aromatase, so none of it converts to oestrogen. Combining esters gives a single injection both an early release from the short chain and a longer tail from the heavier ones. Maxtreme labels by trade name rather than chemistry, so the substance line is worth reading: what is in the glass is trenbolone three times over, not three different hormones.
