HQRP Elastic Dust Cover w/ Bag for Yamaha P-35 / P35 / P-35B / P35B / S-90ES / S90ES / S-90XS / S90XS 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!