Watch for your model number when looking to replace these | Customer (after) Service Email great!
When shopping for the replacement parts, it was within various products and comments that I finally figured out I needed the model number. All the pictures and so forth were overwhelming. The model number for my Ninja Professional 900 wasn't visible (at the time) so I obtained it from my receipt with Amazon (2020).The replacements are a perfect fit as a result of determining the model number. I had not realized how beat up my original large cup had gotten. I use it for frozen veggies/fruits/nuts which rather put some dents on the inside. But I have used it since 2020 pretty much every day and many times twice a day. I'd say that's pretty much outstanding quality. I liked my Ninja so much I purchased one as a gift for my son. He liked it better than some of the fancier blenders he had purchased in the past. He recently purchased lids for his cups and totally likes having them since he can drink them w/o spilling while on the go or close the container for storing the beverage.Within a few days of my purchase, I received an email from Amazon from the seller, ABTER. Absolutely great customer service for those who might have purchased the wrong replacements. I have written them and suggested the information be readily available for people browsing to purchase the right replacements.While I wrote them, I double-checked on the bottom of my Ninja Professional 900 (BL456). Turns out the model number IS on the underside but it is fairly small, located very near the inner rim in embossed print of the same color/material as the base. Depending on eyesight and lighting - it's easy-er or difficult to see. If I had a white permanent marker, I would color the embossed print for future reference.I'm so glad I purchased the correct replacement cups. If I had not, the seller offered a very nice return option. Meanwhile, the cups are so shiny and new! Sturdy construction (as the original) with tight fitting lids. And I now have 2 cups. No, I'm not leaving one for later on, but I should. I'm rotating them. I'm quite impressed with the after-purchase email from the seller! That's customer service!