Blackwell Square Glass Bowl, Square Black Rack, 19 X 19 X 4-3/4" . The stylish and sturdy Blackwell Collection by Tablecraft is unmatched in its presentation. With its mod shaped green glass and innovative metal racks, these display bowls will transform any lobby or reception area into the hippest place around. The glass is dishwasher safe, metal rack is handwash only, and not recommended for microwave use.