Useful and practical tools: the traditional nozzles provide good pressure, they can clean the shaded areas between the teeth and under the gums, which facilitates their installation and their smooth operation during cleaning.93% more effective than floss dentistry for gum health. 4-piece set: four nozzles for the whole family. The different colors make it easy for each member to find their own color (colors may vary). This product only contains plug head fittings, which must be used with the machine, applicable brands and models include: 1, waterpik: only suitable for WP - 100 series / WP - 250 series / WP - 450 series / WP - 560 series / WP - 660 series / WP - 811 series / WP - 861w / WP - 900 / WP - 940 / WP - 950, not suitable for WP - 60 / WP - 70 / WP - 72 / WP - 360/WF-03EC/WF-02.2, Flycat: Only fit for FC168/FC188/FC158, not fit for FC159. 3, waterpulse: v300/v400/V600/v660. 4, can not be used for other brands of tooth stampers. Quality and Guarantee: Safe to use guaranteed, tip made of food grade resin ABS Replacement period: For reasons of hygiene and efficiency, Replace the tips every 1-3 months due to your frequency of use.