Styles like the Pelham and Kimberwick combine the curb and snaffle actions. Many trainers claim that these hybrids don't succeed in a clear communication, but some horses go best in one of these models. The Pelham has four bit rings. The Kimberwick resembles a D-ring snaffle, except it has a ported curb mouthpiece and a low ratio of leverage. Both types use curb chains.
Accessories enhance the bit's function.
A curb chain is a standard accessory for curb, Pelham, and Kimberwick bits. Some horses go better with a leather strap, or a leather or rubber cover over the chain. A leather lip strap, added to a curb or Pelham with a straight shank, prevents the horse from lipping the shank. Choosing the right bit design depends on your needs and specific goals. If you plan to show in a specific discipline, confirm that the bit meets current association rules and the unwritten rules of show ring fashion.