Ninja blender owners, these replacement cups are lifesavers when your original ones get worn out or damaged! You get two 16oz cups plus four lids total - two sip & seal lids and two regular sip lids. They're compatible with most Ninja single-serve models including the BL660, BL740, BL770, BL780, BL810, BL820, BL830, and QB3000 series. The BPA-free material is durable and shatterproof - I've dropped mine a few times with no issues. The upgraded flip-top lids are fantastic - they seal tightly so no leaks in your bag, and the 180-degree flip makes drinking smoothies so convenient. The clear measurement lines let you see exactly how much you're making, and the 'MAX FILL' line prevents overflows. They're dishwasher safe for easy cleaning too. Just remember these are for 16oz cups only - not the 18oz, 24oz, or 32oz sizes. If you use your Ninja blender regularly for smoothies, protein shakes, or other drinks, having extra cups is so handy - you can prep multiple drinks at once or have backups when one's in the dishwasher. The quality matches the originals at a much better price - definitely worth it if you need replacement cups.