Phillips RC-XL is a resilient sound channel manufactured to exacting specifications to minimize sound transmission through wall partitions and ceilings. Phillips RC-XL also works great to prevent ridging and cracking in ceilings. RC-XL is deeply knurled for positive screw placement and to eliminate wandering. Lab-certified, written test results are available upon request. RC-XL Resilient Sound Channel features a hot-dipped galvanized material to provide extra corrosion prevention.