Strap Material: Silicone
Case Material: Zinc alloy
Buckle Style: Tang Buckle
Width: 20mm (0.79")
Wrist Size Circumference: Fits wrist 140 - 200mm (5.5" - 7.9"), Adjustable length without tools.
Compatible with: Ultra and Series 9, 8, 7, 6, SE, 5, 4, 3
Package Contents: 1 x Retrofit Kit for Apple Watch (Watch not included)