Tefillin, tallit: For morning prayers (tefellin are leather straps with boxes containing Torah scrolls; a tallit is a Jewish prayer shawl). "Before I interact with anyone else, I use these to connect to God."
Wallet: Cash, credit cards, driver's license, and a small siddur, or prayer book. On top is his Knesset ID -- "the key to my office," he says, "and, in a way, to every other door in the state of Israel."
Book: The Hebrew edition of Rabbi Meir Kahane: His Life and Thought -- Volume One: 1932-1975, by Kahane's wife, Libby. Ben-Ari recalls Kahane as a "wise, courageous, and committed" teacher.
Pedometer: "Reminds me I need to walk at least 10,000 steps a day. Some days I use the Knesset gym, but only during the men-only hours."
Car key: All Knesset members are given vehicles -- Ben-Ari's is a seven-seat Mazda5, almost roomy enough for the entire family.