No Cap Technology(NCT): NCT is a new technolgoy compared with the old technology to take the PEP bag and foam from the inder side of the rims in prodcution.
The old technology have to  open a hole (40x10mm) on the  valve hole area, then take out the PEP bag and foam, and then stick a carbon cap by glue.
By this way, it is easy and time saved. But the cap is thin and weak, very easy to crack.

NCP is a new way to take away the PEP bag and foam.Rather than open and hole and glue a cap, NCP move away the PEP bag and foam by assembling holes on rim bead.
By this new way,time cost much longer, but rims' valve are mcuh stronger, so the time worth.

Our rims:

Other's rim:

Rims with cap are easy to crack: