You will receive 20 hat size reducers, 10.3 x 1.9 x 1.8 cm, which can help you reduce the size of your hat by about 0.11 cm. It comes in two colors, black and white, with 10 pieces of each color, for a total of 20 pieces, enough to meet your daily needs. In addition, this type of hat filler is suitable for various types of hats, allowing you to wear different hats comfortably. Material: Made of 3M adhesive and environmentally friendly EVA foam, it is small in size, soft and comfortable, portable and practical, and can be firmly attached to hats. And thanks to its practical design, you don't have to worry about the hat falling off when you put it on. High-quality products: You can stick them directly to the inside of the sweatband, or you can sew them to the sweatband to make it more secure, so you don't have to worry about it falling off. You can also cut the hat insert into different shapes to match different hats. Easy to use: The head circumference of the hat is large and loose, and using a hat to reduce the sticker can effectively reduce the head circumference. Just peel off the protective film on the adhesive side, stick the adhesive side of the hat to the inside of the sweatband, and press with your hand to use.