SVERNESAILS - Model: S-3 - Size: 4.7 - Mast Size: 400 - Boom Size: 164 - Brand: Severne This is a 3-batten sail. Fewer battens are better for catching the wind, especially when riding waves. Severne sails are light, so even in underpowered conditions, they feel quite responsive. The way the wind fills the sail feels great. Thank you for looking. This is a used item. It is in very good condition. If you have any questions, please ask in the comments.