What backing plate size does it fit?
Use it with a 125mm plate.
Is it aggressive in terms of cut?
Microfibre pads are capable of mid to heavy cut, but the performance depends on the polish, machine and technique used in combination with the pad. Think of it as a heavier cut pad for orbital use instead of reaching for a heavy cut orange foam etc.
How do I clean it?
Rinse under a running tap with neat washing up liquid, massage the fibres until free of polishing dust, rinse and then air dry.
Will it work on a rotary?
Microfibre pads are designed for orbital/DA machines, use a wool pad or heavy cut foam pad with a rotary.
Does it finish down well?
Microfibre pads can finish down fairly well, but always follow it up with a mid or soft pad/polish combination for better refinement.