The band of the LUX9007 retrofit kit is made of silicone. The overall case is made of  316L stainless steel build carefully polished. The buckle is made of 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 LUX9007 retrofit kit. Comes in a high quality package with installation tools included. BAND MATERIAL Silicone CASE MATERIAL 316L Stainless Steel BUCKLE MATERIAL Stainless Steel BUCKLE TYPE Pin Buckle CASE SIZE 50mm*60mm CASE THICKNESS 14.5mm BAND FITS WRIST 165mm – 230mm COMPATIBILITY MODELS Apple Watch Series Ultra COMPATIBILITY MODELS CASE SIZE Apple Watch 49mm KIT WEIGHT 95 Grams BOX INCLUDE AS FOLLOWS 316L Stainless Steel Case x 1 Silicone Band x 1 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 LUX9007 Retrofit Kit doesn’t affect the water resistant of the Apple Watch. Other watch faces appearing in the product images are realized by the third-party apple watch wallpaper plug-in App Clockology, please note that it is just a wallpaper.