1, API Standard; 2, Designed for Oil&Gas Reservoir Fracturing; 3, L,M,H three series for differ usa; 4, High fl conductivity ... , Sichuan or Henan, China (Mainland)4.Application:Oil & Gas Development, Specifially designed for Oil&Gas Reservoir Fractruing5.Material:Alumina Ceramic6.Density: Light ... Number:20-40, 30-50, 40-70, etcSpecifically designed for Fracturing.Ceramic Proppant. Ceramic Proppant