We really like this spring....It is a good bit shorter and seems to fit in between some of the other brands models.

Blue/Medium is stronger than a yellow Malossi, but not quite as strong as a red. This makes it a perfect choice for stock 50cc quads.

The red/firm spring is stiffer than red Malossi, but lighter than a ZTR 1000.

We like them a lot and think you will too.