Logitech MK550 Comfort Wave Wireless Keyboard Replacement Key Button Part YR0053 This Auctions is for replacement keys ONLY for the Logitech K350 keyboard. The buttons are very easy to replace, you can pop out the old button and interest the new one and it's ready for use. Each key added to Cart will be $3.95 You can also choose an Entire Row of buttons. Replacement USB Unifying Receiver is also available for $14.95 Feel Free to Ask us any questions.