The A000018 plastic holder from Arduino is custom made to fit all types of Uno Board for board protection and longevity. The holder makes it easier to grasp, handle and fastened with screws the Uno board. Also the holder can be used with breadboards. Holder colours:. Supplied in a pack of five in assorted colours For Use With = Arduino UNO, Genuino UNO Colour = Dark Blue, Grey, Light Blue, Orange Grey, Orange, Yellow Body Material = Plastic