The "Why I Go To Church On Saturday" tract is clear, concise, and straight to the point. It outlines Biblical truths of (1) the Sabbath being instituted at creation; (2) Jesus' examples of keeping the Sabbath; and (3) the Sabbath being reinforced in the new Jerusalem.
Recently I was talking with a prison Chaplain who jokingly said, "Oh, you are the people who keep the wrong day." He went on to say that he follows tradition, to which I replied, "We follow the Commandments." I plan to give him this tract which compares "tradition" with the "Commandments."