The phrase "special insert" refers to something that is added or included separately in a publication, package, or document to offer additional information or features. Full definition
This is great for those who may need special inserts. (geekwrapped.com)
All in two - these consist of a waterproof cover with special inserts — if baby is just wet you can reuse the outer a few times, these are handy for out and about as they take up less room in your changing bag (funkymonkeypants.com)
Inside, the Cruze Stealth gets black leather seats with contrast stitching, special inserts on the door trims and a navigation system. (rediff.com)