Each part is printed with the corresponding caliber number
These brass rod ,brass jags,Tip slotted are made of solid brass by CNC precision process.
brass is more durable than plastic,and brass is lower in hardness than alloy steel so won't wear down your gun.
Note: .357 Cal./ .38 Cal. / and 9mm These three calibers are almost identical, so you can use the same parts for cleaning.
This universal gun cleaning kit almost suitable for all types handgun cleaning.