You can use this coffee dosing ring with confidence because it is made of food-grade material with good rustproof, wear-resistant and corrosion-resistant properties, which is very safe and healthy. Due to the good anti-spill and anti-side leak performance of this coffee dosing ring, it can reduce coffee waste and dirty countertops, which can offer you with a good coffee making experience. It is constructed of aluminum alloy material. There are 3 sizes for your reference. It is suitable for home, cafe, kitchen, hotel, etc. Item Name: Coffee Dosing Funnel Material: Aluminum Alloy Features: Rust-proof, Spill-resistant, Wear-resistant Size Details: 51mm: Length: 5.1cm(Approx.) 54mm: Length: 5.4cm(Approx.) 58mm: Length: 5.8cm(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Coffee Dosing Funnel