- Good sound projection<br />- Not subject to heat， humidity and other weather conditions<br />- Durable and won't swell， soften when wet<br />- 4 pieces included<br />                                                                                                                                Dimensions: 2.4 in x 0.47 in x 0.12 in (6.1 cm x 1.2 cm x 0.3 cm)<br />Weight: 0.71 oz (20 g)