Check the listing for details. Excalibur Crossbow Serving Wax String Conditioner Archery Accessory. Color: Blue, White, Condition: New with tags. Listed at 9.99 USD. Keep your crossbow string in top condition with this genuine Excalibur Crossbow Serving Wax. This essential archery accessory helps to protect and prolong the life of your crossbow string, reducing wear and tear while improving performance. Easy to apply, it's a must-have for any crossbow enthusiast looking to maintain their equipment properly. The wax comes in a convenient container, perfect for your archery kit or range bag.