These blender bottles fit my ancient Oster blender, which is good. I have no interest in buying a new blender just for smoothies. Oster has stopped making them, so I have to resort to 3rd party items. OTOH, these aren't as sturdy as the Oster bottles. This is my second order of this brand. I originally purchased 3, and have had 2 self-destruct over time (holes punched in side by small ice cubes while blending). Best advice to avoid that is to start at the slowest speed until the ice has been chopped reasonably well, then ramp up. The lids are useless, as were the ones on the Oster-branded bottles--very difficult to open, no point in using them. Just pour the smoothie into a travel mug if you plan to take it with you.As a note, there does seem to be a discrepancy in the description as to what type of plastic was used in making them. No one in my house cares, but if this is a concern to you, I suggest you contact the vendor for clarification.