Sunsational Bingo Daubers - Yellow Ink Markers. These daubers are used for playing bingo and come in a set of 12 bottles. Here are the key points from the description:

1. Product Name: Sunsational Bingo Daubers - Sky Blue Ink Markers
2. Quantity: Set of 12 bottles
3. Ink Type: Sky Blue-colored ink
4. Ink Size: 4 ounces per bottle
5. Ink Formula: The ink is brilliant and is vibrant and eye-catching.
6. Bottle Sleeves: The bottles come with color-coordinated sleeves that are available in various bright and sizzling colors.
7. Color Perception: The brilliant ink colors are designed to appear brighter to players of all ages, emphasizing that this feature is particularly beneficial as people age and their ability to perceive colors vividly may diminish.

In summary, these Sunsational Bingo Daubers seem to offer a colorful and visually striking way to mark bingo cards, with an emphasis on the brightness and appeal of the ink colors to players of different age groups.