MAC Double Feature Eyeshadow Duos ($25.00 for 0.09/0.10 oz.) are pre-filled with nameless eyeshadows. Some of the duos contain 0.09 oz. while others contain 0.10 oz. From the ones I have, Double Feature #5 and #8 contain 0.10 oz., while the others contain 0.09 oz. The four featured in this post are: Double Feature 5 (pale frosty peach / dark brown with green pearl), Double Feature 6 (light grey taupe / mid-tone bronze), Double Feature 7 (bright fuchsia / cool black), and Double Feature 8 (mid-tone orange / deep navy). Once I can purchase #7, I will update this post with a review and photos/swatches for it.
Edited @ 7/11: Added photos, swatches, and review for Double Feature 7.
The only duo that gave me cause for concern was Double Feature 8, because the purple/blue shade was rather hard to work with from both a texture and pigmentation standpoint. It was dry, stiff, and color payoff was low. In Double Feature 6, the light taupe was slightly sheer but that is me being nitpicky–it still had good color payoff.