Adopting great silicone material, this watch case opener let you use for a very long time. Though it is simple in design, it's so practical when you use it. The excellent workmanship of this opener will bring you a . Easy and convenient to use, safe to your watch case, it is a useful watch repair tool. Features - ColorAssorted Color - Material: silicone. - Size: 6.50X6.50X6.50cm/ 2.55X2.55X2.55inch. - This friction balls is a wonderful alternative to the standard watch case opener. - Suitable for any tool kit whether you're a watchmaker or a watch hobbyist. - Easy to operate and use. Hold the watch in one hand and in the other hand, press the friction balls onto the back of the watch. - It makes you open the watch back case in an easy, precise, and safer way, will not hurt your hands or watch case. - It's smart design allows it to fit and evenly grip the surface, giving it more strength yet never scratching your watch. Package list: 3 Case Open Balls