The strap ring is made of durable and wear-resistant TPU material which can be combined with your activity tracker and provides a comfortable wearing experiencethey are the ideal replacement safety ring for lost or damaged straps. The replacement fastener sleeve is ideal for wristbands or smart watches such as Charge2 Boneng A370 Boneng A360 Garmin Garmin Fenix5 Fenix5 Plus Forerunner 945 Forerunner 935 Forerunner 630x Garmin instinct Garmin Forerunner 735XT Samsung Galaxy Watch Samsung S3 Huawei GT Sports Watch etc. UK Seller - VintageTimeWatches Ltd The strap retainer is made of durable and wear-resistant TPU material which is lightweight and soft offers you a comfortable wearing experience and can be worn for a long time. The fastening ring of the watch strap is black lightweight comfortable and wear-resistant comfortable to wear.