The Leather curb is used in conjunction with your bit, it is milder than the metal version and helps to help prevent chafing.
Available in Black or Brown leather. Pony, Cob and Full sizes.
Pony - 5"(13cm) plus 3 chain links each end
Cob - 5.5"(14cm) plus 3 chain links each end
Full - 6" (15cm) plus 3 chain links each end