Select copper and tin prices gained at the non-ferrous metals market here today on stockists' buying amid good demand from industrial users. While, nickel, zinc and lead declined due to sluggish demand from alloy industries. Tin recovered by Rs 10 per kg to Rs 1,395 from Monday's closing level of Rs 1,385. Copper cable scrap, copper scrap heavy, copper utensils and copper billets inched up per kg each to Rs 455, Rs 450, Rs 421 and Rs 483. However, nickel slipped by Rs 10 per kg to Rs 975 from Monday's closing level of Rs 985.