Genuine Oclean P-series replacement heads - for daily use, harder DuPont and Pedex brand bristles, hardness 8 out of 10. Suitable for users with healthy teeth and beginners. Designed for all Oclean toothbrush models - X, X Pro, Elite, F1, Air2, One, Z1. The number 5 in the name indicates the colour of the head only, all P series heads are identical. One piece in the package.