Sections for I-95, Root 66, Model 88, Hot-Rodder and Rodrunner come in the all purpose Flexichain which has a chain center, a stiffer Proflex which has a spring center, and a hollow style. Proflex is also available with a heavier duty 5/8″ spring center. Choose from three coupling styles. They snap together in a second and are taken apart quickly with a spanner wrench or uncoupling key. With the more recently developed “G? connector, no torque is put on the locking pin when running in reverse, making it a durable coupling.