Matrix M110 150% Irregular Pitch AEG Upgrade Spring (330-390FPS) Folding Knives It utilizes the open-top design

It utilizes the open-top design with bungee cords to hold the mags in place securely until needed

Handle: Glass Reinforced Nylon

Discreetly compact enough to stow in your shirt pocket

Sharp looking and reliable

Compact body design

Matrix M110 150% Irregular Pitch AEG Upgrade Spring (330-390FPS) Folding Knives It utilizes the open-top designThese Matrix springs are build after careful study of major Japanese spring sets providing all the features you'll look for in an AEG spring for maximum performance. It is made out of high quality anodized piano wire, with tension carefully measured. Systema's irregular pitch, Prometheus's Stainless steel material and PDI's durability are all features duplicated and found in a Matrix spring. Test shown that this spring will last you longer, is more