ECG Pattern Flexible Silicone Watch Band for Apple Watch Series 4 44mm, Series 3 / 2 / 1 42mm - Red / Black ECG pattern design, simple look Soft and flexible silicone, durable and not easily deformed Size adjustable, universally fits wrist Classic pin buckle, easy to use An ideal strap replacement for your old, broken one Compatible with: Apple Watch Series 4 44mm Apple Watch Series 3 42mm Apple Watch Series 2 42mm Apple Watch Series 1 42mm Package included: 1 x ECG Pattern Flexible Silicone Watch Band Watch band only, other items not included Size: 130-185mm (without watch)