Perman Luxury Silicone Watch Band Strap Watchband for Samsung Galaxy Gear S2 SM-R720 Blue Material: Silicone. Compatible for: Samsung Galaxy Gear S2 SM-R720. Maximum Length: 22cm/8.7". Minimum length: 15cm/5.9". Strap width: 2.0cm. The size can be adjusted according to the circumstance of individual wrist. Softness is moderate, wear very comfortable. Compression molding, sturdy and durable.