A heads up about Kool-stop. On their web page it states that the same pads are used on the Hope E4 and V4. I can tell you that they're not. The E4 and Mono M4 are the same pads, Fwiw. The E4 pads are slightly smaller in length. 3mm to be exact. If you try to put the V4's in the E4's they won't fit. The E4 pads in the V4 caliper rock back and forth when you hold the brake and push/pull the bike. I think that can lead to damaging the caliper, snapping the pin causing you to lose your pads/brakes altogether or the pads getting jammed on the rivets of the disc. They also reference "Tech 4 E4" which don't exist. I believe they mean "Tech 3 E4". Don't buy the Kool-stop pads for Hope brakes at least.