Size: You can adjust the size freely.38mm/40mm/41mm Size suitable for 5.5"-7.5" (140mm-190mm) wrist; 42mm/44mm/45mm Size suitable for 6.3" - 8.3" (160mm-210mm) wrist. Easy to adjust the length to fit your wrist. Please choose the correct watch model and size for yourself Compatible Models: The Autism Awareness Puzzle Piece Cartoon silicone sport bands 38mm 40mm 41mm are compatible for iWatch SE, Apple watch Series 7/6/5/4/3/2/1, Sport, Edition, ALL VERSIONS High quality materials and easy to install: Made of high quality soft silicone material, it is lightweight and durable. The Autism Awareness Puzzle Piece sports band is easy to install and has lugs on both ends for precise, secure locking to the Apple iWatch interface. Cartoon Autism Awareness Puzzle Piece pattern design: the unique pattern band makes the smartwatch look more fashionable. The band uses an advanced printing process to ensure the color of the pattern does not fade. Occasions and gifts: The Autism Awareness Puzzle Piece watch band is suitable for many occasions. Perfect for modern style, everyday wear and sports. A gift for your loved ones, your family and friends during weddings, parties, birthdays, holidays, anniversaries, etc. After-sales Service: To enhance customer service. If you have any questions about this item, please feel free to send a message through Amazon. Your message will be answered within 12 hours.