This magic bowstring can be used to string a nonmagical bow or crossbow, turning any attack made with it into a magical one. A kinetic bowstring magically amplifies some of the stored kinetic force that it releases when it fires an arrow or bolt. The first ranged attack you make on each of your turns using a weapon strung with this item has twice its normal range, and on a hit, the attack deals one extra die of its damage.
Kinetic bowstrings were crafted with Transmutation Spellcraft which amplified the kinetic force when firing an arrow or bolt. They could be used to string a nonmagical bow or crossbow, turning any attack made with it into a magical one, and were extremely difficult to snap or break despite their incredible ability to handle force.