Weight Effect on Stability: The weight of a disc can also affect its stability. The rule of thumb is: a heavier version of any given disc will tend to be slightly more overstable than a lighter version of the same disc.
Plastic Blend Types Effect on Stability: On many occasions manufacturers will produce the same disc mold in a variety of plastic blends. Different plastic blends will affect the overall stability of the same disc mold. There will be minor differences in flight numbers ratings within the same mold, when made from different plastics blends. In addition, the more durable plastic blends will retain flight numbers ratings for a longer period of time. For full information on all the different plastic blends, please refer to each manufacturer plastic types overview page.