Well this purchase was a disappointment. Let me start by saying I've used Kleenbore jags for many years and love them. For 40 and 10mm I've always used their 9mm jag with an extra large patch because I've never seen one in 40. I got so excited when I saw they make on for 40 so I bought four of them. Well... they are labeled 40 but they are exactly the same as the 9mm.