Includes: Package includes four packs of three for a total of 12. Compatible: See Full Details for a list of compatible models. Material: Made using 304 stainless steel, plastic and Dupont Tynex. Toothbrush Heads: Get a set of 12 Oral B SB-17A compatible electric toothbrush heads. Long-Lasting: With this pack of spare toothbrush heads you won't have to buy another toothbrush anytime soon! | Oral B Compatible Toothbrush Heads | Wowcher