Silca's Impero Ultimate Frame Pump revamps the famous original using an aluminum construction and the finest component materials. The alloy barrel and head house an aluminum handle piston and rod that push on Silca's renowned leather washer made in Milan. All that air makes its way through a brass check valve that is similar to that used in their floor pump and then through a synthetic elastomer gasket that uses a 2-stage sealing design that holds onto valves without requiring a locking lever. Silca has made their name by producing pumps that work well along with looking good so it only takes 112 pumps on the size small to get a 23 mm road tire up to 100 psi.FlexWing Technology Fits Tube size between 1" 25mm and 2.5" 60mm. Silicone Bumpers for secure fit and Ultimate Paint protection. Most efficient Inflation of any Portable Pump 112 strokes = 100psi size Small. 2 Stage Sealing Advanced Elastomer Head No fussy lever to mess with. 100% Full metal construction No plastic parts to break bend slip or rattle and covered by SILCAShield.