At 500 mg per millilitre this is the most heavily loaded testosterone blend Pharmacom Labs makes, roughly double the strength of the Pharma Sust 300 listed beside it. A 10 ml vial at that concentration holds five grams of hormone in total.
Concentrations this high need a large proportion of solvent to hold the steroid in solution, which makes the oil noticeably thicker and less comfortable going in than a standard-strength product. That is the trade every high-milligram preparation makes. The contents are a mixture of testosterone esters for intramuscular use, each unit coded for verification.