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Higher-end springs made by the same OEM that SHS use. They are made from the more expensive Japanese certified quenching steel with ground-down ends allowing smoother contact with the spring guide. I test each batch when they arrive from the factory.  Please use my test setup and results only as a guide, your FPS will differ.  

If you do need to cut down a spring one good guide I've found is here:

Test AEG Setup Using 0.2g BB
Good cylinder, cylinder head, piston head and nozzle compression
4/5 Cylinder
Hop set off
Bearing on Spring Guide
No Bearing on Piston Head
No AOE correction
363mm ZCI inner barrel
Lonex hop chamber
ZCI 60 degree hop

Power Rating
M90 = 295 to 305 FPS with 0.2g
M100 = 320 to 330 FPS with 0.2g
M110 = 370 to 380 FPS with 0.2g
M120 = 385 to 390 FPS with 0.2g
M130 = 445 to 450 FPS with 0.2g
M140 = 460 to 470 FPS with 0.2g
M150 = 480 to 490 FPS with 0.2g
M160 = 510 to 530 FPS with 0.2g

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