Each cylinder is hand crafted and made of the finest, industrial strength crystal clear acrylics. The cylinders are tapered toward the top to match the natural anatomy of your penis for maximum comfort. No gaskets are required. Each cylinder contains a state-of-the-art air valve which allows for quick and easy disconnection from the pump while maintaining pressure within the cylinder.Measurements: 9 inches in length, 1.75 inches in diameter.Material:andnbsp;AcrylicColor:andnbsp;ClearNote:andnbsp;Compatible with Size Matters pumps, sold separately.