Contact spring socket strips accommodate the gaps between parts of the housing. The strips are mostly made of copper-beryllium, since this material has ideal spring characteristics. In addition copper-beryllium is resistant to air, UV radiation, ozone, solvents and radioactive radiation. Contact spring socket strips are used for instance in telecommunications and data processing. Contact spring socket strips possess outstanding conductivity and are therefore used mostly to provide contacts, but they are also used as screening materials.