as reducing friction. Extruded: The Polyethylene base material is cut from a large sheet, or squeezed out of a machine much like "Play-Doh". A low maintenance base, it is the least expensive and easiest to repair. Extruded bases are smoother and less porous than other bases. They do not saturate with wax well, and tend to slide slower than other bases. But left unwaxed they do not lose much overall performance. Extruded P-Tex is also cheaper than sintered P-Tex Sintered: Polyethylene base material is ground to powder then reformed with pressure and heat, and cut to shape. A sintered base is very porous and absorbs wax well. Sintered bases slide faster than extruded bases when waxed, but will be slower if unwaxed for a period. They are more expensive, and harder to repair. Sintered Hybrid: Sintered bases may have graphite, gallium, indium or other materials added. These materials are used increase glide, strength, "wax hold" and other desired characteristics. Edge: A strip of metal, tuned normally to just less than 90-degrees, that runs the length of either side of the board. This sharp edge is necessary to be able to produce enough friction to ride on ice, and the radius of the edge directly affects the radius of carving turns, and in turn the responsiveness of the board. Kinking, rusting, or general dulling of the edge will significantly hinder the ability for the edge to grip the snow, so it is important that this feature is maintained. However, many riders who spend a fair amount of their time grinding park rails, and especially handrails, will actually use a detuning stone or another method to intentionally dull their edges, either entirely or only in certain areas. This helps to avoid "catching" on any tiny burrs or other obstructions that may exist or be formed on rails, boxes, and other types of grind. Catching on a rail can, more than likely, result in a potentially serious crash, particularly should it occur on a handrail or more advanced rail set-up. In addition, it's relatively common for freestyle riders to "detune" the edges around the board's contact points. This practice can help to reduce the chances of the rider catching an edge in a choppy or rutted-out jump landing or similar situation. It is important to keep in mind that drastic edge detuning can be near-impossible to fully reverse and will significantly impede board