Key by Jopen Stella IAchieve stronger orgasms with the Stella I Single Kegel Ball Set from Key. Stella I comes with a silicone single kegel ball holder that holds one of two interchangeable weighted silicone balls (30g and 40g). For best results, begin with the lighter weighted ball (30g), insert and squeeze. One single ball holder with retrieval loop. Wrapped in body safe silicone.