Poly Fiber Toilet Brush in the Toilet Brushes department at Lowes.com
Full Circle Scrub Queen™ Replaceable Head Toilet Brush & Ceramic Base – Full Circle Home
Amazon.com: Sellemer Toilet Brush and Holder Set for Bathroom, Flexible Toilet Bowl Brush Head with Silicone Bristles, Compact Size for Storage and Organization, Ventilation Slots Base (Silver) : Home & Kitchen