Want proof your barrel is clean? Unlike traditional brass jags that can give a''''false positive'''' when testing barrels for copper fouling, Bore Tech makes aproprietary heavy-duty alloy jag that has excellent tensile strength and featuresa special coating that seals the jag to protect it against harsh chemicalsand makes it 100% barrel safe. Eliminating brass with a Proof-PositiveJag will not only give you a cleaner rifle bore, but you'll save time andmoney by cutting back on wasted patches and chemicals. Proof-PositiveJags are precision machined to strict tolerances to provide true, concentricpressure on barrel surfaces. Get the best cleaning results by using Proof-Positive Jags with Bo Mfg: Bore Tech