Mutagen vs Carcinogen Mutagen and carcinogen are two terms that have a lot in common. There is a potential that a single substance could be both of them at the same time and be only one of the two, as well.
A curb bit is a type of bit used for riding horses that uses lever action. It includes the pelham bit and the Weymouth curb along with the traditional curb bit used mainly by Western riders. Kimblewicks or Kimberwickes are modified curb bits, and a curb bit is used in a double bridle along with a bradoon.
Some General Facts. 1  Standard bit width size is 5 inches. (Snaffle bit) 2  Horses with small muzzles or jaws usually wear a 4 1/2 inch mouthpiece. 3  Horses with larger muzzles or jaws usually take a 5 1/2-6 inch mouthpiece. 4  Rule of thumb is that there should be one wrinkle at the corners of your horse's mouth--no more! (snaffle bit)