Parameters:EB17-X:Standard clean type,Suitable for wholesome oral inhabitants EB17-XS:Soft and touchy type,Suitable for folks with gingival bleeding, irritation and sensitivity EB20-X:Precision cleaning type,Suitable for folk searching for legit oral care EB58-X:Bamboo charcoal clean type,Suitable for folk with gingival bleeding, irritation and sensitivity EB50-X:Multi-angle cleaning type,Suitable for healthy oral populationSuitable Toothbrushes Type:DB4010、DB4510、D12、D16、 D20、 D29、D34、D36,Pro600、600plus 、Pro650、Pro700、 Pro1000、 Pro2000、Pro2500、Pro3000、 Pro4000、 Pro5000、 Pro6000、 Pro6500、 Pro7000、Pro8000、 Pro9000、 0C20,3709、3744、4729、3756, 3757, etc. If you don&;t understand. You can consult customer support