Abstract: The ski described is characterized by the use of a selected fiber reinforced material comprising a sheetlike textile material and a thermoset resin, the fiber content being 30-70% by weight and the fiber being not less than 30% by weight synthetic. This material is notable for high flexibility and high restoring forces and confers excellent properties on the ski, for example good vibration damping.

Abstract: A sealing for back and forth moving machine elements, particularly for the sealing of rods for hydraulic cylinders, with a seal which seals against the housing as well as against the axially back and forth moving machine part, a preceding protection element which is arranged between the seal and the pressurized chamber of the cylinder, and a stripper, which stripper is turned toward the atmosphere. The preceding protection element is provided with a lip, the lip being directed toward the oil pressurized chamber, which lip touches the back and forth moving piston rod and has openings, which openings produce a connection between the pressurized oil chamber and that oil chamber which is formed between the preceding protection element and the lip seal.