Make of PP, corrosions-resistant and easy to clean, ensuring that it remain as new after long term use Effectively avoiding unevenness during the powder pressing process, ensuring the of each cup of coffee We three different sizes of 51mm, 53mm, and 58mm, which are suitable for most coffee machines and meet the needs of different coffee grounds The flat bottomed threaded bottom design ensures consistency during each compaction, prevents tilting, and improves stability Specially designed for professional and family coffee enthusiasts, this product uses even pressure to make the coffee powder denser, thereby improving extraction efficiency and ensuring that each cup of coffee has a richer and more fragrant flavor