Check the listing for details. 1 1/2" Pinball Insert Leveling Mylar Stickers - Fix Cupped, Sinking Inserts!. Condition: New. Listed at 6.99 USD. How to Level, Fix, and Protect your Pinball Inserts w/ Invisible Mylar Stickers No more stuck balls! Included: 5 Circular 1 1/2" Insert Leveling Mylar Stickers. By applying insert mylar, you're not only protecting the insert paint, but the playfield wood and paint around the insert hole.