I purchased this on Amazon, but it was the wrong size, so I am selling it. One has been opened, but it is unused. ● Compatible Models Replacement toothbrush heads for Panasonic Doltz electric toothbrushes, made with US DuPont material (DuPont nylon). Compatible models: EW1000-1046, EW-CDP 33-35 52-55, EW-DA 21 37 41 43-46 51 52 57, EW-DE 20 21 24 25 40-45 54 55, EW-DK31, EW-DL 11 12 21-23 32 34-39 43 53-58, EW-DP 33-37 51-57, EW-DT 51 52 63 72 73, EW-LA 20 25 30.