bgm says:
"bgm PRO clutch springs are manufactured in Germany and are subject to continuous quality control. The Oteva70® material used makes the springs block stable and true to size. The spring does not deflect sideways until the blockage, but returns to its original length when unloaded. The clutch spring retains its full spring force. The spring rate is significantly tighter than that of an original spring.
NOTE: Only for use with BGM Pro Superstrong clutches.
Ideal for performance-enhanced engines.
Product safety information
Manufacturer information:
Scooter Center GmbH
Kurt-Schumacher-Str. 1
50129 Bergheim-Glessen
Deutschland
info@scooter-center.com
https://www.scooter-center.de