Pair of John Deere hub caps.  Part no. M78511.  These are from the rear of an LT155.  They also fit STX30, STX38, STX46, LT133, LT150, LT155, LT160, LT166, LT170, LT180, LTR155, LTR166, LTR180, GXs, SXs, RXs, SRXs RIDERS.