Adapters allow you to go from an [L/large] interchangeable tip to an [S/small] interchangeable cable or a [S/small] interchangeable tip to a [M/mini] interchangeable cable. Please note you can't convert in the opposite direction (small to large or mini to small).
Cord connectors will combine two cords together for a longer length.
Swivel adapters convert any fixed Twist or X-Flex cable to a Swivel cable and are available in both small (sizes 2-8) and large (sizes 9-15).