Special Designed: Compatible with Suunto Core SS014993000/SS013331000/SS018816000/SS013337000 only. Not for other models! | Great Wearing Experience: Made of TPE, neither too hard, nor too soft. Comfortable and durable. | Size: There are 13 holes to adjust the size. It fits for wrist circumference form 6.69'' to 9.05''. You'd better measure your wrist circumference before purchasing. | What you can get: 1 set of straps; 2 tool needles; 4 connectors. Note: The watch is not included. | After-sales service: Please feel free to contact us if you have any question about our products and service. Replacement or full refund with any quality problems.