High Velocity Lightened Valve Spring Upgrade for Tippmann A5, X7, and 98's and similar is what you need to get if you want or need more velocity from your marker. This spring is approx. 1" in length. Ensure yours is the same before buying. If you need or want more velocity out of your Tippmann A5, X7, or 98 and a new drive spring is just not doing it, try our modified valve spring. It will yield higher velocities than the stock valve spring. It may be just want you need to get that added speed. This is great for people who have a lightened hammer and need more velocity or for those just looking to shoot at higher velocities. Please be sure to remove and measure your stock valve spring before buying. We offer a 1" spring and a .75" spring. Spring is 0.95 in Length, make sure this is the length you need before you buy.