i beg to differ with what dan and dave said. I say get a joe porper card clip. Where i live, the humidity and temperature warps cards too fast. Its a good idea to invest in one you will be able to tell that they definately last longer. I never regreted getting one. Handle them with care dont handle them with dirty, oily or wet hands. Place them back into the box or into the joe porper clip after use them let them sit for awhile. They will be 'unwarped'.