From the Rulebook
Bolts may never be used as a hand or melee weapon. The “point” of all bolts must have a diameter of at least 2.5 inches. An arrow scores hits like any other weapon. Arrows from short bows and single-hand crossbows do two points of damage to armor. Properly colored head Cover may be used in lieu of Ribbon.
See also the Crossbow page.
From the Equipment Construction Section of the 7.2 Rulebook
Bolts are generally fragile and are often broken under the constant rigors of fighting. Arrow shafts made from graphite offer a flexibility and resilience not found in their aluminum or wooden counterparts. Wooden arrows or bolts must be taped along their entire length. All arrowheads must be removed from the arrow, and the base of the arrow at the tip must be built up with a sufficiently strong material to at least the diameter of a penny, which is used to cap the arrow. Arrows may not be drawn beyond 28 inches, and must have a stopper in place if they are longer. Arrows must have a minimum of 2 inches of closed cell foam on the tip, and it must be at least 2.5 inches in diameter. It is suggested that you also incorporate a layer of open cell foam to reduce the recoil of the arrow when it strikes a solid surface. Arrow fletching and nocks must be in good repair, and arrowheads should be checked regularly for degrading foam. All arrows must be clearly labeled with their owner’s name on the shaft. Properly colored head covers may be used in lieu of ribbons.