Phillips RC-1 Weath-Ex® Tru-25® is a resilient sound channel manufactured to exacting specifications to minimize sound transmission through wall partitions and ceilings. Phillips Weath-Ex® RC-1 Tru-25® also works great to prevent ridging and cracking in ceilings. RC-1 is deeply knurled for positive screw placement and to eliminate wandering. Lab-certified, written test results are available upon request. Weath-Ex® RC-1 Tru-25® resilient sound channel features an extra surface coating over hot-dipped galvanized materials to provide extra corrosion prevention.