A shrink ink for printing, one side is and the other side is glossy. Note the side for printing. After printing, the shrink film can be cut, microwaved or heated with a heat for final compression within 1-2 minutes. 21 x 29cm/8.2 x 11.4 inches, 0.3mm thick. It will shrink by 20% after heating, and it will become 5 times thicker after heating, free to cut according to your needs. perfect for creating sophisticated and accessories such as key chains, jewelry, gift tags, bookmarks, scrapbooking, and decorations. Our printable shrinkable dink board key chain set includes 15 white printable shrink plastic sheets, 20 key chains, 100 split rings and 5 colorful lobster clasps, perfect for kids and crafts activities for Christmas, Mother's Day, birthdays, holidays and more. The process of shrinking the film is a and exciting experience. It is very suitable for interacting with children in the classroom or , observing the changes in the shape of the shrink plastic film, bringing visual pleasure and cultivating their hands-on ability. Notices: 1. Recommended for children 4 years of age and older. Adult supervision required during baking. 2. The frosted-side up when baked is recommended. 3. Do not touch the shrink piece right after it's baked because it's very hot. 4. Applying white emulsion or epoxy resin over top of the can prevent them from rubbed off or smudged. Color: White Material: metal Package Contents: 30 x Shrink Paper Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.