Swivel cheek bits are THE all around bit---a transition tool, swivels are an untraditional, but functional tool for helping to bridle in the California style.
Swivel cheeks are commonly used in every western activity both for schooling and showing because of the free swiveling cheek pieces that allow lateral pulls to be more effective and less shocking to the horse. They provide lost of pre-signal and the bit flexibility makes this style of bit a wonderful and understandable tool for most horses.
Swivel bits with solid mouthpieces that have a roller are cow horse legal, IF there is a hobble between the bottom loops plus at least a one-inch port.