19pcs/set helmet pads includes 9 pads with 10 hook and loop circles to apply the 9 pads. Great add on for helmets, soft, durable and washable. The replacement pads are approximately 3/4 of an inch thick. The helmet pads are made of foam, which is a closed cell foam generally used for forming costumes, exercise mats. Good assortment of pads, which are solidly constructed soft and comfortable on the head. The hook and loops are strong and won’t come off if you pull the pad. The different sizes make it easy to size properly. Please make sure the surface is clean and smooth before applying the hook and loop circles.