This durable and smooth silicone band fits any Apple Watch for a snug, comfortable fit during exercise or everyday wear. Material: Soft silicone material with a smooth finish for a sporty look. Size: 38/40/41mm - 135mm -190mm - Small/Medium 42/44/45/49mm - 180mm - 223mm - Medium/Large Fits: Series 1, 2, 3, 4, 5, 6,7,8 and SE