1, API Standard; 2, Designed for Oil&Gas Reservoir Fracturing; 3, L,M,H three series for ... .Type:Fracturing Ceramic Proppant3.Place of Origin: Guizhou, Sichuan or Henan, China (Mainland)4.Application:Oil & Gas Development, Specifially designed for Oil&Gas Reservoir ... :20-40, 30-50, 40-70, etcSpecifically designed for Fracturing.Ceramic Proppant. Ceramic Proppant