Size: (L x D) 

Large Plug Length: 3.6" Diameter:1.6" Net weight: 156g 

Medium Plug Length: 3.15" Diameter: 1.3" Net weight: 91g 

Small Plug Length: 2.7" Diameter:1.1" Net weight: 50g 

Material: Chrome-plated steel. Its surface is quite smooth,nice touch feelings in hand,and convenient to insert inside.