The hubs 70 are preferably injection molded in a single shot from relatively hard plastic materials such as nylon and {HEAD ~ the tire portion} 72 of {TAIL ~ the pinch rollers} 20 may be subsequently injection molded onto the hubs 70 whereby the rollers 20 are easily constructed by a two shot injection molding process 
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The hubs 70 are preferably injection molded in a single shot from relatively hard plastic materials such as nylon and { HEAD ~ the tire portion } 72 of { TAIL ~ the pinch rollers } 20 may be subsequently injection molded onto the hubs 70 whereby the rollers 20 are easily constructed by a two shot injection molding process
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