Thank you for viewing. AERON MCT-26X aluminum boom. It extends from 140cm to 190cm and comes with an RDM adapter, so it can be used with either SDM or RDM masts. It shows signs of use, but I was using it until November of last year, so I believe there are no problems with its functionality. There are scratches, so those who are concerned should refrain from purchasing. Please check the photos. Shipping is free via Mercari delivery. Thank you.