Description: Double volume for drummer performance. Can be used as a musical instrument accompaniment. Double row of sand tubes can be rotated and separated into a single sand tube. The filling particles in the sand tube are medium-sized moderate and the decibel interval is 79-81DB which is suitable for use in small performances. Material: Size Chart: Approx. 170 x 80 x 4mm / 6.69 x 3.15 x 0.16inch Package Includes: 1 Piece Double Row