F-10/12/15 single 10-inch 15cm MDF baking paint box body, f-10/12/15 are respectively 140 magnetic 51 core (iron), 170 magnetic 75 core (aluminum), 170 magnetic 75 core (aluminum), high tone 90 magnetic 34 core soft and hard, low frequency round and full with elastic, real and natural, high-temperature voice coil guarantee unit long-term work.