The TM 25 was developed off of a recommendation from a horse trainer friend of mine. We took our TM 22 mouthpiece (our big correction) and welded it solid where the bars tie into the port. The result of that change was an incredible feeling bridal. It has a ton of control, but the best part is that your horse won’t fight it. They aren’t scared of it at all even though it has so much control. I believe that the reason for this is a couple unique features that this bit design offers. The port is 2” tall with 1.5” of tongue relief. This means that the port is taller and wider than average which is where the control comes from. Another feature that is unique to this bridal is that we only put Mullen in the bars, instead of across the entire mouthpiece. The last feature that gives this bit a lot of the feel and control is the way the ball bearings drop a little below the bars where they tie into the port. Most of the time we tie the bars in flush to the port. Long story short I’m riding this bit on my heel horse and really love the way it feels. I highly recommend it!