Hi Gerhard,
Micro jigging classes can vary from other peoples view. From my own application you would class it using jigs as small as say 10 - 40/50/60 grams.
Reels are normally a 2500-3000 size spinning reel, using PE line of either 0.8 to 1.2. Leaders can be as light as 10 - 20 lb with fluorocarbon being a length of between 2 - 5 mtrs. Water depth of around 8 - 30 mtrs using rods of a length of around 6 ft to 6'4ft long.
Fish species of your reef fish are a target like red rock cods, snapper etc. Kingfish jump on a micro jigs at times too.
Tight Lines !.
Regards
Leo