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. Ideally, you consider the horse, and how the bit will communicate with comfort. Comfort, Not Resistance Horses vary in their tolerance of a bit.