The band of the LUX8008 retrofit kit is made of fluororubber. The overall case is made of 316L stainless steel and carbon fiber beauty combined to create. The buckle is also made of 316L stainless steel. Silicone Protective Case are included inside the case to avoid scratching the Apple Watch. You will be amazed by the overall quality and style of the LUX8008 retrofit kit. Comes in a high quality package with installation tools included. BAND MATERIAL Fluororubber CASE MATERIAL 316L Stainless Steel/Carbon Fiber BUCKLE MATERIAL 316L Stainless Steel BUCKLE TYPE Special Press Folding Buckle CASE SIZE 58mm*60mm CASE THICKNESS 18mm BAND FITS WRIST 175mm – 225mm COMPATIBILITY MODELS Apple Watch Series SE/4/5/6/7/8/9/Ultra/Ultra 2 COMPATIBILITY MODELS CASE SIZE Apple Watch 44mm/45mm/49mm KIT WEIGHT 74 Grams BOX INCLUDE AS FOLLOWS 316L Stainless Steel/Carbon Fiber Case x 1 Fluororubber Band x 1 316L Stainless Steel Buckle x 1 Back Cover Screws x 5 Silicone Protective Case x 1 Screwdriver x 1 The Apple Watch appears in the product picture only to better show the retrofit kit compatibility, product excluding Apple Watch. The LUX8008 Retrofit Kit doesn’t affect the water resistant of the Apple Watch.