Made of high quality material, and practical to use. Exquisite and delicate, highly matched with equipment This O ring is located twice in the for brewing unit and once on the brewing piston. Model compatibility for , for ESAM, for ECAM, for Prima Dona, for , for For brewing unit like the plunger Suitable for coffee machines, and like devices of the same construction. Part number:5332149100 Colour:Red Material:Silica gel Size:Diameter 36mm;width 4.1mm Package Contents: 10 * sealing ring Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.