Made of silicone materials, and practical. Convenient and easy to use in coffee maker. These practical coffee maker sealing ring can be great coffee lovers. They are good accessory for coffee maker, coffee pot. Features - Color: Assorted Color -Material: aluminium alloy, silicone -Size:5.20X5.20X0.25cm/2.04X2.04X0.10in; ring inner diameter: 3.9cm; ring outside diameter: 5.2cm; filter diameter: 4.6cm (50ml,1 Cup Size) -Size:5.60X5.60X0.30cm/2.20X2.20X0.12in; ring inner diameter: 5cm; ring outside diameter: 6.5cm; filter diameter: 5.8cm (150ml, 3 Cup Size) -The sealing gasket and filter is for espresso coffee machine, workmanship, perfectly fit. -Easy to install and can replace the original factory sealing of the special silicone ring for the coffee pot. -Works great in your kitchen or coffee , good as coffee pot replacement parts. -With fine workmanship, not easy to wear and tear, very practical in use. -Made of silicone and aluminium alloy materials, , flexible, and safe for a long time use. Package list: 3 x silicone gaskets 1 x filter