Liberty Aluminum Monocoque SDM Boom 160-210 Grip diameter: 26mm (?) Includes Neil Pryde adapter If you have an adapter for RDM, it can also be used with an RDM mast. Although it's aluminum, it's about as light as a carbon boom 140 base. It hadn't been used for a while, so it turned black due to deterioration, but it's gotten better after wiping it repeatedly, so the problem should disappear with use. The uphaul line and sheet are deteriorated, so please replace them before using. If you don't need them, I will dispose of them, so please let me know. I will ship it via Fukuyama Transport Co., Ltd. to their office, with the recipient paying the shipping costs. Please note that I cannot provide compensation for any damage during shipping. I can also hand it over at a designated location within Aichi Prefecture, so please let me know if you'd like to arrange that. Please understand that this is a used item, and make your decision based on the photos. No returns or refunds will be accepted.