Non-toxic Walnut shells and recycled plastic 13.97cm x 8.3cm x .64cm Set of 2 scour pads Ever notice that walnuts look like little brains? Pretty cool. What’s more impressive is that their shells work as a natural abrasive to scrub surfaces without scratching. Now that’s smart. Scrubbing pad made from walnut shells for natural scouring power, Gentle on surfaces, yet effective and durable.