Materials: Sodium bicarbonate, sodium lauryl sulfate Size: Single piece size: 2.5*2.5*1.5cm Color: As shown in the picture 1. High-efficiency cleaning formula, quickly dissolves scale, oil stains and detergent residues, and thoroughly cleans the drum and inner wall of the washing machine. 2. Easy to use, each piece is individually packaged, one piece at a time, and 1-2 times a month can keep the washing machine clean as new. 3. Remove odors, effectively inhibit the growth of mold and tidy thing, and ensure that clothes are fresh and odorless. 4. Suitable for drum and pulsator washing machines of various brands and models, with strong compatibility and no damage to the machine. 5. Safe ingredients, no phosphorus, no fluorescent agent, friendly to the family and the environment, and safer to use. Package includes: 1 package contains 1/2 products