Lightweight red and green ripstop nylon Air Flow Tels attatch to sails with waterproof adhesive locator discs. No holes required. Tels show the air flow across the sails, allowing you to to trim sails for maximum performance. Each kit includes 14 Tels and full instructions on where to apply them and how to read them. Product Type:Phone Accessory Item Package Weight:0.023 Kilograms Item Package Dimension:0.025 cm L X7.62 cm W X15.24 cm H Country Of Origin: United States MODEL NO - 950