Plastic Types:

A-Soft

A-Soft plastic is the most flexible of the three and has excellent grip even in cool and rainy weather.  Discs from A-Soft are less stable  than discs from  the other plastics and they do not skip at all or do it minimally,

A-Medium

A-Medium plastic is moderately flexible and keeps a good grip even in cool weather. Discs are less stable than A-Hard plastic discs but more stable than A-Soft plastic discs. They are suitable for both forehand and backhand player.

A-Hard

A-Hard is minimally flexible plastic. A-Hard discs are more stable than the others and skips more than A- Medium and A- Soft discs. They are  first choice of forehand player.