Mocoosy 138 Pcs Heat Shrink Plastic Sheets Kit, Shrinky Art Films Clear Sanded Shrink Sheets Include Shrink Papers with Keychain Accessories and for Kids Creative Craft

I bought 3 different Shrinky Dink Kits, and all three had a different shrinking time, and they would curl up differently. This one I found if you didn't round the edges, you would have to contantly try to work with it in the oven to keep it from over curling. As your project shrinks, they curl and get thicker and harder to flatten out. And be sure to put over sized holes in the sheets before shrinking as you will shatter. Make sure you color on the ruff side of the sheet. If you aren't going to seal your project with top coat finger nail polish or my favorite UV resin (well ventilated area). I pre bake my projects, and on warm sunny days, I set up a table and do the resin and uv device then (safety 1st). These can make for some family fun. Test an area about the size you'll want before possibly ruining your project. I have one that shrinks by 20 to 30% and my favorite 50%.