1、1. Compatibility: 20mm strap is compatible for Samsung Galaxy Watch 4 40mm/44mm and for Galaxy Watch 4 classic 42mm/46mm, compatible for amazfit, for Garmin, for ticwatch. Silicone dual color strap. 2、2. High Quality: Made of eco-friendly silicone material, no odor and harmless, soft but durable, the silicone strap can withstand cold or high temperature, whether you are swimming or hiking, it is an ideal choice for you or your best friend. 3、3. Suitable wrist circumference: Suitable for 5.5-8.7 inches (139mm-221mm) wrists, the size can be adjusted according to wrist. 4、4. Various colors are available: Easy to wear, flexible and light. Colors are changeable, changing different colors to represent your different moods every day. 20mm is compatible for:Compatible for Samsung Galaxy Watch 4 40mm/44mmCompatible for Samsung Galaxy Watch 4 classic 42mm/46mmCompatible for Samsung galaxy watch3 41mmCompatible for Samsung galaxy watch Active 2 40mm /44mmCompatible for Samsung galaxy watch Active 40mmCompatible for Samsung galaxy watch 42mmCompatible for Samsung Gear sportCompatible for Samsung Gear S2 classicCompatible for amazfit GTS 3Compatible for amazfit GTS 2eCompatible for amazfit GTS 2miniCompatible for amazfit GTS 2Compatible for amazfit pop proCompatible for amazfit popCompatible for amazfit BIP UCompatible for amazfit GTR 42MMCompatible for amazfit GTSCompatible for amazfit BIPCompatible for amazfit BIP liteCompatible for amazfit bip 1SCompatible for ZEPP ECompatible for Garmin Forerunner158Compatible for Garmin Forerunner 55Compatible for Garmin vivoactive3Compatible for Garmin vivoactive3 musicCompatible for Garmin venuCompatible for Garmin venu SqCompatible for Garmin vivomove3Compatible for Garmin vivoMove LuxeCompatible for Garmin vivoMove styleCompatible for Garmin vivomoveCompatible for Garmin vivomove HRCompatible for Garmin forerunner245Compatible for Garmin forerunner245musicCompatible for Garmin forerunner645Compatible for Garmin forerunner645musicCompatible for ticwatch GTHCompatible for ticwatch E3