It is TNE, Testosterone, no ester. Basically, for Test to be absorbed through the skin, or any molecule for that matter, it needs to have a molecular weight under 300 (along with a substance to carry it across the skin and into the blood stream). I believe TNE is 296 or so.
Since it has no ester it needs to be applied everyday to keep the blood concentration of it higher. Testosterone with its esters: Propionate, Cypionate and Enanthate make the molocule too large (heavy) to pass through your skin.