Description Designed for easy snapping and faster installations. NWS Composite shims are waterproof, resist splitting, impervious to insects and offer much greater load bearing capacity than wood. Composite Shims are 8" long and tapered from 5/16" down to 1/32". WARNING: This product can expose you to chemicals including Lead which is known to the State of California to cause cancer, birth defects or reproductive harm and Butyl Benzyl phthalate (BBP) which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov