HQRP Elastic Dust Cover w/ Bag for Casio Privia PX-350 / PX350 / PX-350BK / PX350BK / PX-780 / PX780 / PX-860 / PX860 Electronic Keyboard Digital Piano + HQRP Coaster HQRP dust cover is made of spandex and having exceptional elasticity is suitable for most 76-88 keys keyboard models. HQRP dust cover is made of spandex and having exceptional elasticity is suitable for most 76-88 keys keyboard models. It is especially designed to protect your instrument from dust and moisture. The dust cover is equipped with a special bag having a plastic cord and locking clasp for easy storage. 200 days warranty!