Check the listing for details. 5/8" Pinball Insert Leveling Mylar - Fix Cupped Sinking Inserts w Mylar Stickers. Condition: New. Listed at 5.99 USD. How to Level, Fix, and Protect your Pinball Inserts w/ Invisible Mylar Stickers No more stuck balls! Included: 22 Circular 5/8" 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.