Aluminium sethopo le ntlo ea serapeng Hangata e sebelisoa khalase e tiisitsoeng ea 3mm kapa khalase e tiisitsoeng ea 4mm. Re fana ka khalase e kopaneng le maemo a EN-12150. Bobeli likhutlo li 'nè le e bōpehileng joaloka khalase ka customized ho latela ditlhoko tsa bareki.