Tippmann Valve Spring allows you to get more velocity when you need it. This may work in both 98, A5, and X7 Tippmann Markers but you will need to ensure that your stock valve spring length is approx. .75 inches in length. If you need or want more velocity out of your Tippmann and a new drive spring is just not doing it, try our lightened valve spring. It will yield higher velocities than the stock valve spring. It may be just want you need to get that added speed you need. Softer than the stock valve spring.