What a great idea to pair two classic vibrators into one pretty package for hours of solo or shared fun. Try thrusting with the colossal 9" vibrator, while thrilling your clit with the compact 4.5" fellow. All kinds of naughty variations are possible. Big vibe is 1.25" thick and uses 2 C batteries. Travel size vibe is 0.75" thick and uses 1 AA battery