Shimano actually has 3 different color of brakes..Red, Green and Gray...All are different and provide more or less braking than the other..The green or red may be thicker or more plastic wall than the other....I think the gray on is the thinest and provide less braking. With the combination of all 3, A reel can be fine tuned for casting...In my opinion, 2 in the out position always works with me no matter the color of the braking ear...Not sure if this helps but was explained to me that way....