The ream and plug holder part of the tools are good quality steel and not cheap junk.
Starting in the mid 80’s working for GoodYear tire and rubber company shops I know how to plug tires and I know what good tools are! This is the good stuff you are looking for to keep in your car or truck!
I highly recommend this kit to anyone that is able to do the work of plugging their own tire to get them out of a jam.