High-concerned chemical: None - This Zisha tea set is crafted without the use of any high-concerned chemicals, ensuring a pure and authentic tea experience. Each piece is meticulously shaped from the clay, known for its quality and durability. Material: Clay - Renowned for its thermal properties and mineral-rich composition, clay enhances the flavor of tea. This set offers a combination of tradition and quality, making each sip a testament to centuries-old craftsmanship.