They work great until you get over 500 lbs of spring pressure... more pressure, the quicker they will gall.

Have had a bunch of customers not listen to me & end up galling their Pro Mags on Solid Rollers. Nice to know Comp is now bushing them...

PRW Chrome Molys are an almost exact copy of the Pro Mags, & have a thick bronze bushing in them... Alot less $, more choices of rocker ratios...(Pro Mags only 1.5) only problem is the adjusters are brittle. I just went over 8000 miles this morning on my PRW's on my 440, mild street solid roller, 190 seat, 550 open. I put T&D adjusters in them... been great rockers other than the adjuster issue.