Reinsman Easy Rider- Sweet iron modified Billy Allen 5 1/4" mouthpiece. 
 
"Modified Billy Allen has more mullen relief than a standard Billy Allen to result in soft, even pressure across the tongue, bars and lips. Center barrel has limited movement to prevent bit from scissoring down into the tongue or up into the palate with plenty of rotation. Sweet iron naturlly rusts to create a sweet taste to increase salivation for a supple mouth."