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3150 RPP14 DD 55mm Wide ISORAN Double Sided Timing Belt Type_High Torque Timing Belt optibelt ALPHA Power High Performance3150 RPP14 DD 55mm Wide ISORAN Double Sided Timing Belt Isoran RPP DD is the classic double sided type of Isoran transmission belt, made in chloroprene rubber and suited for a very wide range of applications. Compared to Isoran Imperial Pitch, they can transmit more power per the same width, although they are less performing than the top of the line Isoran Platinum, Gold and Silver2 belts.