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The Mighty Marble Double bullet was a complete flop for us. It's poorly designed, made of cheap material, and did not perform well for us. It broke after one use... leaving me with nothing but a pair of decent bullets and a lingering sense of disappointment. I do not recommend this product at all.
Terrible. Repeat terrible. This ring will break very easily, the vibes stop working if they get to body temperature, and the design hurts my shaft and prevents full penetration without causing clitoral injury. Luckily, it's really easy to clean if you have to throw it away after the first use! Avoid at all costs.
Evolved Novelties developed the Mighty Marble Double Bullet as part of the Zero Tolerance line. It is a stretchy cock ring, with two multi-speed, multi-mode vibrators and an attached ball. It is designed to go on the shaft in front of the testicles, with one vibrator parallel and one vibrator perpendicular to the ring. The ring can be rotated to provide the most stimulation to you and your partner. The parallel vibrator actually cuts into the center of the ring, which is pretty unique.