Marker Kingpin 13 Demo AT Ski Bindings 100-125 mm Black/Red Alpine Touring. Model: Kingpin 13 Demo. If you should encounter any issues please. The Wobbly Trackstand is a Boulder, Colorado based consignment business specializing in bikes, parts, accessories and apparel. We have extensive experience in the cycling industry, so you can be assured that all items will be the correct fit, in working condition and as-described. We can generally assist you in any compatibility questions you may have. The Wobbly Trackstand has used its best efforts to inspect the item(s) for sale and create descriptions and furnish photographs that fairly and adequately depict the type, condition and image of the goods at the time of sale.