These Seals fit Vita-Mix Action Dome and are Precision cut by CNC computer control They are made from a material commonly used in the Food Science Industry I am a retired Microbiologist with a Food Science background. I started selling these gaskets on Ebay about 15 years ago.  Before I began selling them; I did much research and found what I consider to be the best material for this after market product.  I have currently sold over 4000 individual seals on Ebay ! Picture of dome is for your reference only. ( THE DOME ) IS ( NOT INCLUDED) SHIPPING IS FREE AFTER FIRST PURCHASE! You pay actual USPS shipping cost $5.49 for QUANTITY 1 seal; After that, all additional seals SHIP FREE Discounts apply for additional purchase prices This is not a Vitamix product nor does Vita-Mix encourage customers to buy accessories which are not made by their company. Vita-Mix does not endorse the sale of this item. This item is 100% Satisfaction Guaranteed.