Inoculation loops An inoculation loop is a simple tool used mainly by microbiologists to retrieve inoculums from microorganisms. Different types of inoculation loops. 30010 Hard inoculation loop 1 µl in polystyrene dark green, bag of 20 pieces, sterile. 30015 Soft inoculating loop 1 ?l in polystyrene light green, bag of 20 pieces, sterile. 30020 Hard inoculation loop 10 µl in polystyrene dark blue, bag of 20 pieces, sterile. 30025 Soft inoculating loop 10 ?l in polystyrene light blue, bag of 20 pieces, sterile. 30030 Inoculation needle in polystyrene violet, bag of 20 pieces, sterile.