Last for 6 months: replace every 6 months, good quality and last for a long time. Compatibility: compatible with The Ultra Water Flosser/Kids Water Flosser/ The Traveler/ Cordless Freedom/ Cordless Professional/ Cordless Plus/ Showerpik/ Aquarius Professional/ Complete Care and all Designer Series Water Flossers. Work with models: WP-100, WP-100W, WP-660, WP-662, WP-112, WP-462, WP-670, WP-672, WP-676, WP-250, WP-260, WP-300, WP-900, WP-940, WP-950, WP-952, DS-600W, VA-EB006, FC168, FC188, FC158, V300, V400, V600, V660. Useful and practical tool: jet tips can offer a good pressure, these classic jet tip can clean the shadow zone between teeth and below the gumline, easy to put on, work great on the cleaning job. Set of 6 pieces: 6 pieces flosser classic jet tips for general use, suitable for family using, enough quantity help allocate to each member of the family, also different colors are convenient for the owner to trace, good replacement for the original one.