While itu2019s become not uncommon for drummers to cut holes in their cymbals, and there are some ready-made perforated models, itu2019s hard to tell what their official name is. Most people refer to them as cut-out cymbals. Itu2019s generally believed that perforation can influence the way your cymbals sound, depending on how the holes are located and whether or not they are symmetrical (research has been carried out to demonstrate the effect of cut-outs on frequency in brass models). Many players associate the effect with a u201ctrashyu201d quality to the sound, obviously in a good way. Since cut-out cymbals are most commonly accent ones, the name u201ctrash crashu201d seems to have stuck to the variety.