Exhibit Profile：
PrimeStar independent research and development, production and related technical services mainly include the following respects： ➢ Well completion tools and services,mainly includes：PrimeGuardTM series of subsurface safety valve, PrimeSealTM series of packer, PrimeSwitchTM series sleeve and PrimePlugTM series plug. ➢ Well construction tools and services, mainly includes： StarExitorTM One Trip Whipstocks, StarEdgeTM Premium Mills, and other performance drilling tools, etc. ➢ Casing drilling、Rotat
PrimeStar independent research and development, production and related technical services mainly include the following respects： ➢ Well completion tools and services,mainly includes：PrimeGuardTM series of subsurface safety valve, PrimeSealTM series of packer, PrimeSwitchTM series sleeve and PrimePlugTM series plug. ➢ Well construction tools and services, mainly includes： StarExitorTM One Trip Whipstocks, StarEdgeTM Premium Mills, and other performance drilling tools, etc. ➢ Casing drilling、Rotat
Website：www.petrostaroil.com