It's widely recommended that bondage fans have an emergency release device to free their partner in one of those rare "seconds matter" emergencies.
Experience has shown that using a knife for such purposes often inflicts a greater injury than the original situation would have inflicted.
Experience has further shown that what are often called "EMT scissors" or "EMT shears" can be an excellent, versatile, and low-cost item that (unlike using a knife) has very little chance of inflicting a serious injury in an emergency release situation.
These scissors have white handles to make them more easily findable in an emergency and every pair's ability to cut efficiently is tested before I offer them for sale.
Remember to follow the five second rule. If you're the Top in a bondage scene, then you should position your emergency release device so that you can have it in your hand in no more than five seconds.
One of the pictures shows my own white-handled EMT scissors hanging from a pushpin by the side of my bed -- where I can easily reach it within five seconds (but my bound bottom can't! 😉)
Price includes first class postage within the USA. For expedited shipping and orders outside the USA please email firstname.lastname@example.org for shipping info.