Why ?.750 ID X 3.750 OD X 26.000 [Each] -Because Cast Nylon offers the following benefits: Approximately 1/8 the weight of bronze 1/7 the weight of cast iron 1/2 the weight of aluminum Highly impact resistant High heat distortion temperature Easy to machine and abrasion resistant Their flexibility and performance characteristics have led to Nylons replacing bronze, brass, steel, and aluminum in various mechanical applications.