Phillips RC-1 Tru-25® is a resilient sound channel manufactured to exacting specifications to minimize sound transmission through wall partitions and ceilings. Phillips 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. This product is also available in Standard Duty and Weath-Ex®.