Tiny “tic tac” sized pieces that allow you to join two or more cables together to make a longer cable. Small [S] coded connectors fit onto all [S] coded cables. Large [L] coded connectors fit onto all [L] coded cables. Mini connectors will only work with the Mini cables or Twist Mini tips sizes US000 (1.5mm) to US1.5 (2.5mm).It is highly recommended to use the T-shaped tightening keys when connecting cables together.