What It Is: A dermatologist-developed cleansing brush that effectively helps remove pollution and unclog pores. What It'S For: All skin types. What It Does: Specialized brush head with charcoal infused bristles draws out pollution, dirt and oil to deeply purify skin. Two bristle types go gentle on cheeks, firm to unclog pores. Tilted head reaches deep into the T-Zone. The perfect partner for City Block Purifying Charcoal Cleansing Gel.