The Deluxe Trigger Pump from Size Matters features a unique trigger mechanism for better control which creates a vacuum in the sleeve. A built-in pressure gauge lets you monitor the intensity. A flexible hose attaches the pump to the thick plastic cylinder that is shaped to fit comfortably. Super easy squeeze trigger design for hassle-free pumping and an in-hose release valve lets you quickly and easily release pressure. Also Included is the Triple Erection Ring Set, colors may vary. Pump Measurements: Cylinder has 8 inch internal length, 2.4 inch internal diameter. Material: ABS, TPE Color: Black and Clear.