  It is argued that most of the RTSC hydrides are intrinsic hard type-II
superconductors with strong pinning effects. The pinning centers are long
columnar-like defects, with the radius of the order of the superconducting
coherence length. The core and electromagnetic pinning are both equally
operative, thus giving maximal pinning potential when vortices are oriented
along the columnar axis. The theory predicts: (i) large critical currents, (ii)
huge decrease of the temperature broadening of the resistance in magnetic field
compared with standard superconductors, (iii) large magnetization hysteresis,
(iv) the magnetic irreversible line is pushed toward the second critical field
and magnetization relaxation is much slower. That the RTSC-hydrides are hard
type-II SC can give rise to new physics in these materials.
