Two Hidden blades that can be sheathed and unsheathed within arm weights or ones clothing.
Two blades a little bigger than a normal sized dagger.
Able to be sheathed and unsheathed upon wrist movement.
The use of hiding blades in ones arm weights was created during B's departure from the village after the Chunin exams for a defensive/offensive weapon to add to his arsenal. The use of Hidden blades has been common amongst shinobi for many generations but the originator remains an unknown man or woman suspected to have been an assasin.