Abus Steel-O-Flex 950 bicycle lock: with ABUS Plus Cylinder and ABUS Code Card System Double security – functional details: Hardened steel jacket envelops a strong steel cable – double security, Lock body in steel sheathing protects against violent methods of attack. Lighter than the 900 Series. Besides the mechanical security of locks achieved by constructive diligence and a suitable selection of materials, the cylinder is quite literally the ‘key element’. Three things are important here: user-friendliness, reliability and a high level of security against manipulation.