Galaxy Watch 4 Band Size: They All Take 20mm Bands
Amazon.com: Compatible for Samsung Galaxy Watch Active 2 Band 44mm 40mm Women Men,20mm Smart Watch Band for Galaxy Watch 4 Band 44mm 40mm,Galaxy Watch 4 Classic Bands 46mm 42mm,Galaxy Watch Band 42mm/Watch
Amazon.com: Compatible with Samsung Galaxy 45/44/40mm Watch6/ 5/5 Pro/4/, 46/42mm watch 4 Classic/ 45mm Watch 3 Band, Rugged Nylon Sports Strap With Woven Loop Design, Tough Replacement Band For Men Women :
Samsung Galaxy Watch 3 41mm vs 45mm: which size should you buy? - PhoneArena
Midnight Black Samsung Galaxy Watch - 42mm Bluetooth | Samsung US
Watchband for Samsung Galaxy watch 3 46mm 42mm Active 2 40 44 Gear s3 Watch Band Strap 20 22 24mm Genuine Leather Bracelet - AliExpress