For transformation, micro-particles coated with DNA to be bombarded with gene gun aremade up of :
Silver or Platinum
Platinum or Zinc
Silicon or Platinum
Gold or Tungsten
Plant cells are bombarded with gold or tungsten microparticles coated with the desired gene's DNA. The gene gun method is the name given to this transformative technology. Gene gun technology consists of inserting living tissues with DNA or RNA coated on microscopic gold or titanium particles. Compressed gas, centripetal force (external force used to drive a body along a curved path), electric discharge, or shooting explosives can all be used to accelerate particles at high speeds utilizing the gene gun.