I have both the Caney Creek Molds 4 oz. injector and a Basstackle Twinjector ( dual 3 oz. ) The basstackle twinjector injector cylinder walls are much thicker. This is good and bad. They will stay warmer longer; but unless you pre heat them some; the Basstackle injectors pull heat from the plastic very quickly with the first injection. The CCM injectors will inject "cold" ( no preheating ). Unless I am injecting laminates; I almost always grab the CCM injector. I would not think of injecting laminates with anything other than the Basstackle Twinjector unit. I believe the Jacobs injector and Bears Baits injectors are both thin walled as well. Caney Creek, Bears Baits, and Basstackle all use a common injector port diameter. Jacobs Baits uses a small port. A Jacobs injector will inject the other makers molds; but the other makers injectors will not inject a Jacobs mold. Basstackle and Jacobs injectors have a "keeper pin" on the head; CCM & Bear's do not.