Apricus evacuated tube collectors are made to Australian and International standards. In terms of hail resistance, Apricus evacuated tubes have been independently tested and shown to withstand impact from a 25mm / 1′′ ice ball at 90km/hr. If you are in a region with extreme hail (much larger than 25mm / 1′′) then the solar collectors should be installed at an angle of 45° or greater, which greatly increases impact strength.