Check the listing for details. Tourna Synthetic Gut Armor Tennis Strings. Condition: New. Listed at 12.99 USD. Tourna Synthetic Gut Armor Tennis Strings PRODUCT DESCRIPTION Exceptional all-around playability and durabilitySolid center core wrapped in Dupont Nylon with an outer wrap of Polyester filamentsOffers responsive Performance, Liveliness and DurabilityAvailable in 16g and 17g. 40-foot sets. We ship Monday-Friday 8:30AM - 5PM of EST While some orders will not be shipped out same or next day, they will be delivered by the estimated delivery date. If you desire the item sooner, please, choose expedited shipping options. Tracking: Our system will automatically update you with the tracking info once the order is shipped. To ensure the safety of your items, orders that are valued over $100 may require signature confirmation. Please, contact us through messaging if you need more information on the product