Select base metals including copper, brass, zinc and lead slipped at the non-ferrous metal market here today on stockists' selling amid sluggish demand from industrial users. Copper utensils and lead edged down by Rs 2 per kg each to Rs 419 and Rs 165 from last Saturday's closing level of Rs 421 and Rs 167. Copper cable scrap, copper scrap heavy, copper armature, copper billets, brass sheet cuttings and zinc softened by a rupee per kg each to Rs 458, Rs 453, Rs 447, Rs 486, Rs 351 and Rs 216, respectively.