Microchip - SIR Test Board. These are part of a limited run of ties printed from vintage circuit board patterns. In the electronics manufacturing industry, "SIR testing" is a sensitive test method for evaluating component failure caused by shorts or current leakage. It is used to rate fluxes, board cleanliness and how these wee metal bits perform in humidity. Well fine sir, you may not need your tie to do that, but this is what the image did on your tie in it's former life! Yes, it's printed from a real circuit board screen! Cool, right? This print extends high up on the tie, approx. 17" (43cm) from the bottom point; perfect to peek out from under a vest or jacket. LIMITED EDITION! As is the nature of vintage screens, once these screens die, that's it. (Not knowing the emulsion it was made with, they might hold up for a week, they might last for years!) Choose subtle or bold colors to dress up your geekiest occasion. The tie is made of a soft microfiber, having almost the same hand as silk and is printed with high-quality, non-toxic, waterbased ink. The tie is available in standard, narrow or skinny width, 58" long. All new materials! For reference, standard width is 3.75-4"; narrow is 2.75-3"; skinny is 1.5-2" wide at it's widest point. PLEASE CHOOSE FROM THE FOLLOWING, all listed below are available: ► Microfiber tie choices: silver ink on black standard silver ink on black narrow silver ink on black skinny silver ink on olive standard silver ink on olive narrow silver ink on olive skinny silver ink on emerald standard silver ink on emerald narrow silver ink on kelly green standard silver ink on kelly green narrow ► Please just note your color choice in the "message to seller" when you check out. ► Impress any nerdy guy or girl: computer scientist, programmer, electrician, engineer or maker. Is dad, grandpa, boyfriend or husband a tinkerer with solder and blinky things? Perfect for groomsmen and brides boys of the geeky persuasion. Nerd power!