Here is a group of one of the more interesting and new kind of insert card in the 2010 Topps Update set. They feature manufactured bat (not game-used bat) pieces with the players name, team and facsimile autograph engraved in the wood. I think these are very classy looking, and look especially great when a Hall of Famer is featured. Below is what the reverse of the card look like.
The wood colored bats are all numbered to 99 and there are two limited parallel versions. The black bats (see the Snider below) are numbered to 25.
The rarest of them all are the pink bat versions that are numbered 1 of 1's. UPDATE: BTW, this card is currently on eBay and closes later this afternoon.
Here are the rest of the Dodgers in the set not already shown above.