If the Effetto Mariposa Espresso Caffelatex Inflate and Repair Cartridge didn't work so damn well we would have written it off as just another gimmicky contraption. It's the real deal. To work the Espresso Cartridge, simply connect the nozzle located at end of the flexible silicone tube directly to the Presta stem, and press the button. Caffelatex will flow into your punctured tubular, sealing it and reinflating up to 5 bars of pressure (road tube). The whole process takes less than a minute to inflate and repair—faster than pulling over to answer a phone call.