This is the 2nd KC-S keyboard dust cover I have purchased. Believe me, these covers are a life saver. I never used to cover my keyboards,but I do now. I found out the hard way. Dust can work its way into the key contacts and mess with the velocity. Several notes on my digital piano would play at full velocity,no matter how hard or soft I would strike the key. It cost me $271 to get it fixed. So to save yourself from expensive keyboard repairs, get a dust cover. Get the KC-S stretch dust covers 49,61,or 88 key. They're awesome!