THE GOLD RC 5 joins a sturdy pimple geometry with BIOS technology to create a rubber with stable control and excellent feel. This unique combination of grip and tension allows player to control the rubber effortlessly. This rubber shows its full potential with more powerful shots. The Goldarc 5 was worked on by the DHS development center, German rubber experts, and multiple-time world champions, wang Liqin, and Ma Long, to create the perfect highly elastic, non-tacky rubber. This rubber is the medium hard version.