Yao, Z.Y. Laxdal, R.E. Matheson, B. Waraich, B.S. Zvyagintsev, V. JACoW Geneva, Switzerland A balloon variant of the single spoke resonator (SSR) has been designed, fabricated and tested. The cavity is the SSR1 prototype for the RISP project in Korea. The cavity is specifically designed to reduce the likelhood of multipacting barriers near the operating point. The basic design, fabrication experience and first cold test results will be reported.