What hotend do I have?

So long story short, my brother pieced together a reprap kit, and couldnt put it together. I have the kit fully assembled and working. In pronterface I can heat the hotend, and move all the motors in the correct directions. So I am almost there, but I went to buy filament, and I have no idea what to get. I have a J end with a brass tip. It also has the finned body, so It leads my to believe it is an MK-V or MK-IV nozzle, but I am not sure what size opening it has.

Bottom line, have a MK-V J head nozzle and am not sure what size filament to get. Either 1.75 or 3, I am not sure. Should I just bite the bullet and buy both?

can you take a photo of it ?

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The infeed diameter of the nozzle and heatbreak should tell you the size. I dont know how deep the ptfe liner feeds into the nozzle but you should be able to get the correct size by subtracting the diameter of you ptfe liner from the diamter.