This is a hammock ridgeline made by emma kites, using 2.8mm diameter Dyneema (high-strength polyethylene fiber) with a breaking strength of 780kg. Please note that there may be some areas that are not dyed black (as shown in the last photo), but this is from the beginning. The weight is approximately 19g, and the adjustable range is about 240-300cm. **The first photo is an example of use, and the hammock is not included in the listing.** It has been confirmed to work with Kammok Roo Single (length 254cm) and Roo Double (length 305cm). The usable hammock length is approximately 250-310cm. If the distance between the trees is wide, the hammock may be stretched tightly, making it uncomfortable and difficult to relax. In such cases, this ridgeline can be used to intentionally create slack in the hammock, allowing you to set it at the optimal angle. The mechanism is the same as a whoopie sling, with stepless adjustment. It won't loosen and can be set quickly and securely. It's similar to the Eno "Microtune Structural Ridgeline," but it cannot be used by directly attaching it to both ends of the hammock body. It is used by attaching it to the carabiners or soft shackles at both ends of the hammock (as shown in the first photo). Shipping is free via "Yu-Packet Post Mini" from Kumamoto. It seems that it takes a little time to arrive, and it is expected to take about 5 days from dispatch to the Kanto area. Please note that the status on the web will be "accepted," and tracking will become available the day after it is posted. If you have any questions, feel free to comment!