This is an Epica Star 10mm combination wrench.
It is a double-ended tool with an open-ended profile on one end and a closed-loop (ring) on the other.
The two heads are angled to the shaft for better access to nuts or bolts.
It is made of high-quality chrome vanadium steel with a rust preventative chrome finish for durability.
The size is clearly marked as 10mm on both the wrench itself and the packaging.