When you take a close look at the PETRUS, you will immediately see a clear purpose behind the choice of each component. PETRUS utilizes two torque hinges that hold the lid at your desired angle while unpacking your violin. This also keeps the lid from falling and damaging your bow or instrument. When the case is closed, one single powerful latch provides simple and secure closure to the case with a 3-digit combination lock. Side handle and D-rings are securely placed with specially designed rivets that provide a firm hold with a miniscule chance of failing. The shape of PETRUS was only determined after the proper components were chosen, and we carefully went through countless revisions in order to fully integrate them into the design.