Soluble balls are used to activate downhole equipment in most termination systems for multi-stage hydraulic fracturing. The ball learned to withstand pressure of 100 MPa for several hours, and then small particles are processed a few days. Soluble balls are made of magnesium (Mg) based alloy. or suffer (Al), who are quickly exposed to the box when exposure to any electrolytic fluid, brine KCl, fracturing fluid or formation water. since the balls are soluble, then to start production, after well stimulation, no additional funds required drilling operations