?Compatibility: S Toilet Brush Replacement Heads Are Perfectly Compatible With The Oxo 1043632 Good Grips Toilet Brush Replacement Head And Are Perfectly Compatible With The Oxo 1281600 Good Grips Toilet Brush. | | ?Biodegradable: The Refill Foil Contains A Unique Additive That Facilitates Biodegradation. (They Are Not Compostable) | | ?Multi-Pack: They Come In A 4-Pack. | | ?Strong Durable: Our Toilet Brush Heads Have The Same Strength And Durability As Regular Plastic. They Only Start To Break Down When They Have Been Exposed To Uv Light Or Heat For Prolonged Periods Of Time. | | ?Planet-Friendly: Every Year A Huge Number Of Plastic Products Are Thrown Away, Taking 500-1000 Years To Break Down. By Using S Toilet Brush Heads, You Are Making A Far Better Choice For The Environment! | |