Ferrite cores are great enhancements to any electronic signal transmission line. These magnetic materials absorb signal interference, reduce signal errors and improve signal integrity. Unfortunately, factory molded on versions for large gauge cables tend to be disproportionately large and interfere with each other in side by side connections. These extremely effective, yet very compact snap-on versions accomplish the same task without getting in the way.
Note: These won't fit the 24AWG or 28AWG.