Manrikigusari

Manriki-gusari is a one of the secret weapons of the ninjas in Japan. The shape of manriki-gusari is quite simple. Weights are attached on both ends of the weapon and these weights are connected with a chain. The length of the chain is different depending on the ninja school it’s from. Generally they weigh between 300 to 400g. Basically, manriki-gusari is a self-defence weapon. It is so tiny that Ninjas can bring it in their pocket.

Overview
A one meter long chain with a weight on each end. This weapon is used to parry a weapon and strike aftar, so if you take multiple actions after a successful Parry, or All-out Parry, you only take a -2 penalty. You can also just strike by swinging and hitting with he weight but this gives no special bonus. you can Strike, Grapple, Choke, or Disarm with this after a Parry with no size penalty for weapon size, Choke damage is 1D6+2.

Reference
PASQUARETTE, C. "Pacific Rim Sourcebook". 1st ed. Berkeley CA: R. Talsorian Games, 1994