Class 21 of the trademark registration classification. According to the trademark registration classification, Class 21 includes household or kitchen utensils and containers, combs and sponges, brushes, brush-making materials, cleaning utensils, steel wool, unprocessed or semi-processed glass; glassware not belonging to other categories, Porcelain and pottery. Bathroom ware, etc. Bathroom ware belongs to sanitary ware, so bathroom ware belongs to Class 21 of the trademark registration classification.