<P> The practice pucks are made by a similar but faster process that uses larger pre-forms, 4--5 in (10--13 cm) thick, puts them into moulds automatically, and applies more pressure and heat over a shorter period of time to compress the puck into the standard size . This allows approximately twice as many pucks to be manufactured in the same time period as the more exacting production of NHL regulation pucks . People sometimes freeze pucks to prevent them from sticking to the ice . </P> <P> Roller hockey pucks are similar to ice - hockey pucks, but made from plastic and thus lighter . They have small ribs protruding from their tops and bottoms which limit contact with the surface, allowing better sliding motion and less friction . </P> <P> Most commonly red, roller hockey pucks can be found in almost any colour, although light, visible colours such as red, orange, yellow, pink, and green are typical . </P> <P> Roller hockey pucks were created so inline hockey and street hockey players could play with a puck instead of a ball on surfaces such as hardwood, concrete, and asphalt . </P>

What brand hockey puck does the nhl use