Set of 4 pieces: 4 pieces flosser Periodontal tips for general use, suitable for family using, enough quantity help allocate to each member of the family, good Periodontal replacement tips for the original one.^ Useful and practical tool: jet tips can offer a good pressure, these Periodontal tips can clean the shadow zone between teeth and below the gumline, easy to put on, work great on the cleaning job.^ Work with models: WP-100, WP-100W, WP-660, WP-662, WP-112, WP-670, WP-672, WP-676, WP-250, WP-260, WP-300, WP-900, WP-940, WP-950, WP-952.^ Compatible with most WaterPik water flossers and other brand oral irrigators including: 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.^ Last for 6 months: replace every 6 months, good quality and last for a long time.