I have used exactly similar ProComp 1.6 rockers on a 440. Before the installation I checked all rocker ratios and other functional dimensions. To be honest I was positively surprised about the quality. They were much more better than I expected from a set Made in China or PRC.

Maybe I was just lucky, but last week I bought an other set sold under PRW brand and they seem to share not only the exact same appearance of the ProComp rockers, but the same positive quality I had in the first set.

Notice that ProComps were having ball type adjusters and PRWs cup type.