Adopting great material, these watch case openers let you use for a longer 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 satisfied using experience. Easy and convenient to use, safe to your watch case, it is a practical watch repair tool. Features - Color: red, yellow, blue, green. - Material: rubber. - Size: 6.50X6.50X6.50cm/ 2.55X2.55X2.55inch. - This friction balls is an excellent alternative to the standard watch case opener. - Proper for any tool kit whether you're a professional 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 enables you to open the watch back case in an easy, precise, and safer way, will not hurt your hands or watch case. - It's reasonable design and rubber materials allows it to fit and evenly grip the surface, giving it more strength yet never scratching your watch. Package list: 8 Case Open Balls