I have the invisible shield for my 160GB classic. The full body shield has four main pieces and four tiny pieces. It has a small piece that covers the middle button, another piece that covers the click wheel, a third piece that covers the rest of the front of the ipod (from top to bottom, side to side), and the fourth piece covers the entire back of the ipod and wraps around all four sides of the ipod (both sides, the top and bottom). The top has two holes laser cut into it, one for the lock and one for the headphones. The bottom has laser cut hole for the 30-pin connector.
Finally, it comes with four tiny pieces for the corners on the back of the ipod. They are all round and about the size of a pencil eraser. They fill all the empty spaces between the main back side shield once the two sides, top and bottom fold over. Overall, it is a great way to keep the ipod in good shape. It gives the entire ipod a nice shine, although the new classic material is kind of nice without the shield also. The major advantage is the back piece, as it will keep the back mirror material of the ipod brand new. Without any covering/case, the back of the ipod will scratch the first time it touches any countertop. I have an engraved message also and it looks as brand new as it did the day I got it (the first week when the new ipod classics came out).
For less than $30, you can't beat it. Make sure you install it correctly, as the company will only replace it if it defective and not if you put it on wrong...