possible incorrect part shipped

[s4orce]

I ordered two .6mm jets and upon arrival I inspected the contents only to discover that the jets I ordered might be the incorrect size. the invoice that was shipped with it only indicated part number 806-3xx, and upon inspecting the jet I noticed a very small number 5 located adjacent to the jet hole. Am I to assume this is a .5mm jet ?

[s4orce]

richard, please correct me if I am wrong but the two new jets i ordered did not have a color ring on them at all, I uninstalled the two existing jets ( green ) and compared against the two new jets and while the same name number 5 appeared next to the jet opening they were different sizes. so problem solved I believe but still unsure as to exactly which jets I have.