Budget stock springs from E&C. I would put these on par with ZCI springs. Decent enough material and fairly consistent but don't expect them to last forever. To make top-tier springs you need high quality steel (ideally Japanese), something which I've not found available in China. These springs are good enough for a budget build, for better consistency and reliablility grab a XT Spring.
Available in the following strengths:
M90
M100
M110
M120
M130
M140
M150
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