How do you improve on the worlds most popular electronic percussion pads? Roland"s PD-105BK starts by employing a brand new sensor mechanism for more accurate triggering. Then the PD-105BK includes Roland"s newest dual-triggering capacity, resulting in more even and accurate sensing between the head and the rim. These are the first V-Pads with true rim shot capabilities - including the actual "rim click" sound - on the toms! (when used with a Roland TD-20 sound module)