COMP 6 leash cord made with DIAMOND FLEX material! This product can be used all-around in Japan. - Brand: OCEAN & EARTH - Model: COMP 6 - Wave size: Knee to head-high Please note that if the wave size gets bigger, a thicker leash used for 8-10ft longboards is recommended, as the leash can break due to the wave's force, causing the board to drift away. *This leash thickness and length are the mainstream in Japan. - Material: DIAMOND FLEX - Leash type: Double swivel - Attachment method: Instructions on how to attach the rail saver are included. Thank you for viewing.