I was looking for something quieter and more balanced (less mids) and I came across these on Ebay. I replaced a pair of Lollar P90's which are a great sounding pickup, but not a great match with my other gear. I like Bill Lawrence singles in my Strat and now I like these mini hums too. They are Bill Lawrence Rhythm and Lead 550's. I snagged them off of ebay as NOS from the 70's. They were brand new never installed. They feel and sound good!