Used TOPEAK "MTX BeamRack E-Type". This is an older type of BeamRack, probably purchased about 20 years ago. I haven't used it for about 10 years and have been storing it. There are scratches and dirt, but it's in good condition for normal use. The rubber part that attaches to the seatpost uses commercially available rubber sheets fixed with double-sided tape. I don't think the dedicated rubber for this shape is sold anymore. I used it with a 27.2mm diameter seatpost, but it didn't slip, especially. I will ship it via Rakuraku Mercari delivery with free shipping. Please feel free to comment if you have any questions!