Product Introduction:1 substitute brush head well suited with SOOCAS X3/X3 Pro/X1/V1/V2/D3/X3U/X5 Sonic Electric Toothbrush 2 kit is independently sealed packed. three Dupont bristle , comfortably deep cleansing tooth. 4 Free/No MetalWarm note: If you are not yes whether your toothbrush match for our brush heads,please talk to us firstly, thank you~