The -10 in this Maxtreme name points at the 10 ml vial; the concentration is the usual 250 mg of testosterone enanthate per millilitre. One stoppered bottle replaces a strip of ampoules, so the whole quantity is drawn from a single container over time.
A long ester is the entire reason this form exists: unmodified testosterone clears far too quickly to be workable as an injection, while the enanthate chain holds it back and lets the oil form a reservoir in the muscle that empties gradually. Maxtreme lists it alongside its ampoule version of the same compound.
