sentences:  Depending on the quality of the fit and length of the canal portion of the earpiece, a custom fit in-ear monitor will generally provide somewhere between 25 and 34 decibels of noise reduction.This means that loud onstage instruments, such as drum kit or large 8x10" guitar stacks, are less likely to cause hearing damage for onstage musicians wearing IEMs.Custom in-ear monitors come in a variety of colors but are usually clear or a color that closely matches the skin color of the performer.