18 magnets.This screen contain 9pairs strong magnets,not full height with magnets,if you install the screen well,there won't be gap between each pair magnets.If you want more magnet,please place order to our other Asin.The actual size of this screen is around 100x210cm, 39''x83'' please measure your door frame outer size before purchase.If your door frame outer size is 100x210cm and the thickness of your door frame is wide than 2cm,then this screen can be used on your door.If your door frame outer size is bigger than 100x210cm,for example 105x215cm,but the thickness of your door frame is around 10cm,this screen still can be used onto your door frame.Make sure the screen can be pasted onto your door frame,otherwise this screen's size doesn't fit your door,please choose other Asin.Many customers found they choosed the wrong size after open the package,that will waste your time.Washable by hands.Kids friendly.Easy for installation.Eco-friendly way to protect you from the mosquito problem.Our magnetic door screen use good raw materials,different from the other cheap models.We won't disappoint you.We are the original manufacturer for this product,if you need a custom size screen,please feel free to contact us.