1) good quality CARBON ZINC R20 DRY BATTERY 2) R20 ... end quality to high end quality according to customers'demands.1. size: D/R20/UM-1R20C: 180-350mins2. package1pc/pvc ... 1doz/box, 240dozs/cnt,1300 ctns/20'container.3. Features: 1. ISO9001:2000 SGS, 2.Leakage-proof packing, shelf-time up ... .5.Widely used for flashlights, toys, calculators, clocks etc. 1.5v sum-1 D size carbon zinc dry battery