Features:
Oil Tempered with high pressure treatment
Progressive design, or "Irregular pitch", minimizes spring resistance making it easier to pull the bolt back
Constructed out of 1st class carbon steel piano wire
Long lasting durability and high performance output
 
Spring Type: SP190 Irregular (Progressive)
Spring Velocity: 520~600 FPS (velocity will vary depending on modifications done to rifle, manufacturer of rifle, and internal parts used)
Compatibility: For UTG, Shadow Op, MB-01 and other compatible APS / Type96 series Airsoft Spring Sniper Rifles
Material: Carbon Steel piano wire

Manufacturer: Angel Custom