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These are SPRiT Slow Extreme springs, offered in Slow Extreme I, II & III variants. They start heavier on the keypress compared to standard linear springs and get slowly heavier during the keystroke.
Slow Extreme II springs start 2-3g heavier than Slow Extreme I. While Slow Extreme III starts 2-3g heavier than Slow Extreme II (5-6g heavier than Slow Extreme I).
Slow Extreme II Special Edition (SE) further increases prevision to 99.7%, resulting in only a 0.1g-0.2g variance. These are SPRiT's most accurate springs currently available.
Made from high-quality stainless steel, with 99.5% precision (99.7% for SE). Each pack contains 100 springs.
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