I bought these to seal honey, ghee, or nut bottles for BDT per kg. I used a little bit, and haven't used them since. There is still over 980 grams left, which is about 2000 pieces. Basically, you place these aluminum seals on the glass or plastic bottle and apply heat using an iron or sealing machine to seal them. This keeps the food inside fresh. Those who do business with such products can come and take them. Size: 3.5 feet Location: Mirpur 6, Block C