The original kuro koilers came in 3 sizes, 20, 25 & 30, and had to be ordered separately, plus they cost around $20 apiece. I got mine before the coilmaster came out. I got a coilmaster recently, and it works exactly like a kuro koiler, only it's much cheaper and you get 5 different sizes all in one. It's pretty much a no brainer which one is the better value.