This bundle features four Chirp Wheels that deliver different levels of massaging relief (Stretch, Firm, Deep Tissue, & Focus) INCLUDES: The best-selling Chirp Wheel Plus in 4 of the most popular sizes 12", 10", 6" and 4" Chirp Wheel Plus Wheels Zippered 12" Chirp Wheel Case Upper Back Posture Corrector WARRANTY: 10 Year Warranty