Slime's Thru-Core? tire sealant seeks out and instantly seals tread area punctures up to 1/4 in Dia. There is no need to remove the valve core. Slime's Thru-Core Technology? seamlessly injects the new sealant formula through the valve stem directly into the tire. Then just air up your tire with an inflator to get back on the road quickly. Slime Thru-Core? Tire sealant is non-toxic, non-corrosive and tire sensor safe. This new easy install formula is tested and approved by leading automakers and cleans up easily with water.