Members Mark 30 oz Tumbler Two Pack Two Pack 30oz Tumbler, 30oz Double Wall Tumbler Durable stainless steel construction Double wall vacuum insulation Clear, durable lid with slide latch This set includes two-30 fl.oz (0.9L) double wall tumblers, which are made of high quality 18/10 stainless steel. The insulated double wall desgin keeps drinks hot or cold for hours. The customized lid is stylish, yet rugged and is designed with slide latch to prevent spills. The durability of stainless steel construction makes them perfect for outdoor, home or vehicle.