**Edited**
I ordered a new blade for my BL450, and it works with these cups. I have to use the old blade with the old cups and the new blade with the new cups, but at least I am able to continue using my Ninja.
I have a BL450-70 Professional. The product description states that these fit the BL-450 series, but they do not seal securely. I had a leaky mess inside my Ninja and where the drops flew everywhere. I would not recommend this to anyone with a BL450-70 Pro, as these do not contain liquids as well as the original cups that come with the Ninja. The box these cups are packaged in clearly states: compatible with Auto-iQ Series BL480/490/640/680. BL450 series is not listed on the product package.
From the seller's product description:
Color: Clear-1
Enjoy personalized smoothies and juices on the go with our 2 pack of 24 oz. Tritan Nutri Ninja Cups with Sip & Seal Lids
Attach your Pro Extractor Blades Assembly to the Tritan Nutri Ninja Cup and blend whole fruits, vegetables, nuts, seeds, and ice
Includes two 24 oz. Tritan Nutri Ninja Cups and two Sip & Seal Lids
All components are BPA free and dishwasher safe
Compatible with the BL450 Series, BL480 Series, BL640 Series, CT640 Series, and CT680 Series
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