The package includes 3 Boil-N-Bite trays in case of any errors while making either the upper or lower impressions. Also included are 3 (3ml) syringes which will last up to 6 months of whitening! The gel is bubble gum flavored 22% carbamide peroxide and has been ranked #1 among the industry the past 3 years. Retainer case included FREE of charge Note: This package was designed for the user that would like to begin whitening immediately without having our labs across the globe create their custom trays.