Bobblehead - Sneak

 is a Fallout 3 item, a Vault Boy Bobblehead. It permanently improves your character's Sneak skill by 10, to a maximum of 100.

Location
Found in the Yao Guai Den in the Yao Guai Tunnels on top of a metal box north of the big pool of water. Obtaining Bobblehead Sneak SfR-FAKkwVg