these are m.n. pro 143s for way back. Back in the x-games big air days, he wanted to use them, but he had to use the 164cm 1260's to be able to compete. After that they just went on to make regular length twin tips after that "transitional" year from skiboards to skis.i think they were 78 mm underfoot like the guy above said, ill try to find the old catalog.