Copper Eliminator jags are made from machined aluminum to prevent reaction with ammonia-based solvents and avoid "false positive" copper fouling indications.
These jags are designed to be gentle on the bore and muzzle while being durable enough for hard use.
The jags are compatible with Copper Eliminator rods and other rods with the same 8-32 female thread pattern, except for the .17 and .20 Caliber, which have a 5-40 thread.