The Grip Wrist restraint conforms to any size wrist and virtually eliminates metal to skin contact thereby drastically reducing injuries common with metal handcuffs. No need to "double lock" with "The Grip?"! Weight: 1.04 lbs. The Grip Restraint MRI-Safe Wrist Restraints use brass locking buckles and have eliminated all magnetic properties. The new Grip MRI-safe restraints are the first safe and high security solution.