Silca Electtrico Micro InflatorSilca Electtrico Micro Inflator. The days of CO2 cartridges are officially over. The SILCA Elettrico MICRO packs the power of 4+ CO2 cartridges in a package about the size of an AirPods case. With auto cutoff at 72 psi (no gauge) its safe for use with hookless rims. A single 25 minute charge provides enough power to last for months ensuring it always has your back. Auto shutoff at 72 psi for hookless rim safety with no gauge Accurate to 1% when used