Sold as 5 UNITS at $9.15 per unit. (1 unit = each.) Interchangeable brushes for bathroom cleaning tool. Includes four brush heads. Medium for delicate surfaces. Firm for grout lines and corners. Cone for hard to clean areas. Larger for larger surface areas. Replacement and additional heads for Sonic Scrubber Bathroom - SKU # 6138366. Carded . Manufacturer number: BPB. SKU #: 6138382. Country of origin: China. Distributed by Sonicscrubbers LLC.