Usage Tips:PACK VALUE: It comes with 500pcs clear envelope seals on an easy-to-dispense roll, enough quantity to meet your different needs. Each seal measures 2.5cm in diameter, an appropriate size for cards, boxes, packets and envelopes. HIGH DURABILITY: Non-toxic polystyrene stickers and premium adhesive keep your seal strong for a longer life than other paper stickers. Marking on these labels with an oil-based marker is no problem either. EASY TO USE: It comes in an easy to dispense roll with a punch line, easy to peel and stick wherever you want, done! The strong adhesive also sticks to most surfaces. Self-adhesive stickers let you stick anywhere you want. WIDE APPLICATION: Self-adhesive stickers can be stuck to envelopes, folding boxes and most surfaces. Perfect for sealing envelopes, small packages, retail packaging, brochures, gift boxes, plastic bags and most clean surfaces. LIFESTYLE ASSISTANT: It's perfect for helping you attach notes where you want them to be, making sorting out items much easier in everyday life. A small but great helper for home sorting, office organization and commercial display, making your daily life easier and orderly organized.