The Skwert Popper Topper cap is an accessory that converts most popper bottles into a single hand open & close flip top. It has a one of a kind nostril flange for a direct no waste vapor stream. The cap is easy to open with your thumb and then close with your index finger and hearing a click sound, which indicates the cap is sealed. The cap also prevents spills, stains and odors. There are 2 standard size threaded bottles; the back of the package has a sizing guide to measure which size will fit your bottle. The Popper Topper also comes in a version called the Aroma Topper, and 2 POP kits with 6 large and 6 small in each version. Care Instructions: Wash thoroughly with mild soap and warm water or toy cleaner. Pat dry and allow product to completely air dry. Store separately.