Constructed out of 1st class carbon steel piano wire.
Long lasting durability and high performance output.
Spring Velocity: 420~520 FPS Model: AC-VSR-SP150 Material: First class piano wire / carbon steel. Compatibility: For all Tokyo Marui, JG BAR-10, WELL VSR-10, MB-03, MB-07, G-Spec, M24, M28, AGM L96, and other compatible bolt action sniper rifles with VSR-10 compatible internals.