D4 is a very fast, under stable driver. It is designed for all players and flies extremely far. The D4 will turn up when thrown hard and will then react similarly to the D3 with its long glide and gentle turning finish.
The 350 is a unique blend of plastics designed to be used in several different models to get them into the 140-159g range. The high quality discs produced in this plastic have amazing glide and each model has its own unique flight characteristics. The 350 is a soft, grippy plastic that you will be able to break in over time. Although less expensive this exceptional plastic feels and flies great. The 350 stays grippy even in wet conditions.