New, unused urethane rubber, 1 piece. ◎ For replacement of urethane rubber for Neil Pryde old joint base (～2007 old type) ◎ For replacement of urethane rubber for Streamline joint base (current type, Euro pin/US cup) Can be replaced with Neil/Streamline urethane rubber. Urethane rubber hardness: 95 Used for sail sizes 4.5 to 7.2, 2 days a week for 1 year. The color will darken slightly, but it works without any problems.