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150 gram discs are designed to do exactly what their heavier weight cousins of the same name do, for someone who has less snap and less armspeed than an experienced player in their prime.

In other words, if you meet a pro on the course who throws a 175 gram Wraith 400 feet in a relatively straight line with a little hyzer at the end but you know you have neither the experience or torque to do the same, you could safely assume that you might be able to throw a 145 gram Wraith in roughly the same manner and perhaps get 75% of the distance of the pro (300Ft.) depending on how much torque you actually do have.

Another way to look at it is if you are underpowering your shots - not getting enough speed and torque on them to keep them from hyzering out prematurely - then it will probably benefit you to lower the weights you`re throwing substantially.
The fact is, with less weight in your hand to propel forward, the faster your arm will complete its stroke and the faster the disc will be traveling when it leaves your hand.

The disadvantage to lighter discs is that they can be a bit squirrelly and unpredictable when the wind starts to kick up.
They are certainly more likely to fail when overthrown. But don`t let this stop you from trying them. For many players, these are the key to being able to do what the big boys do.