Neue Schule Leather Curb Strap in Black. The Neue Schule Leather Curb Strap is made from the highest quality Sedgwick leather and is optional with the universal and jumper cheeks from the Neue Schule range. The Leather Curb Strap is fully adjustable and should be fitted onto the small top ring of the bit. The Leather Curb Strap comes into action when the bottom cheeks of the bit rotate backwards by 40 degrees. Please note that the Neue Schule Leather Curb strap sits higher than the chin groove.