Birzman Feexman Cicada Carbon 10 Function. Birzman’s Cicada tool is the beautifully realised evolution of the Feexman Carbon tool. The new organic side plates are stiffer and stronger than ever and all for no discernible weight gain. Quite simply the finest mini trail tool money can buy. 10 functions: Chain Rivet Extractor, Cross Head Screwdriver, Hexkey T25/2mm/2.5mm/3mm/4mm/5mm/6mm/8mm.