This durable cylinder is big enough to take your cock and balls, for maximum results and stimulation. No gaskets required, just hook to one of our Size Matters Pumps, and amplify your penis and balls at the same time. The cylinder is designed to retain pressure, even after the pump is removed. The state of the art valve clicks smooth into place, for a nice seal with strong suction. Designed for maximum comfort, with enhanced results. Measurements: 11 inches in total length, 2.75 inches in diameter Material: ABS, metal Color: Clear Note: Compatible with the EC300 Size Matters Deluxe Steel Pump and AD776 Size Matters Premium Gauge Pump.