cestus

It is against Massachusetts law to carry on your person or in a vehicle any stiletto, dagger, ballistic knife, dirk knife, doubl-edged knife, switchblade knife, slungshot, blowgun, blackjack, metallic knuckles, nunchaku (also referred to as “klackers” or “kung fu sticks” in Massachusetts law), shuriken or similar pointed star-like objects intended to injure a person when thrown, armband with metallic spikes, points or studs, cestus weighted with metal or other substance and worn on the hand, manriki gusari or similar length of chain with weighted ends, or billy club.