Foam-Injected Plastic Block - Ensures additional durability for long-term use Polyester Bristles – Maintains shape for superior better scrubbing and prolonged bristle vitality Cleaning Efficiency – Use the brush as a handheld, with a threaded handle or utilize its molded-in scraper feature Flexible Design - Provides two handle holes for effectively removing stubborn stains from grouted tile Nonabsorbent - Bristles are resistant to oils or moisture