Teflon glass rollers will release the full tonal spectrum from your guitar and keep your notes cleanly separated with a mix cutting, mid hump frequency! Spewing out a soloists dream tone, these rollers really stand out in the mix with clarity and sustain! Constantly lubricating the axle pin, they have a hard time seizing up from hand gunk and grime which adds up to increased long term tuning stability. The standard sized rollers are designed for strings up to .046. For CAM systems, any string larger than that should advance to the larger roller, as well as use two #8413 heavy springs and at least one if not two #9408 wide string hooks to get the right tension and sturdiness needed for the heavy sets.