Product Name: The full name of the product is often "Finishing Touch Flawless Contour Vibrating Facial Roller & Massager." The "Eye Stone" is an attachment that comes with the main roller.

Components: The product typically comes as a kit with two main parts:

Facial Roller: This i a roller head, often made of genuine Rose Quartz or Jade, that vibrates to provide a facial massage.

Under-Eye Press/Stone: This is a smaller, tear-drop shaped stone attachment that can be used to target the delicate skin under the eyes. The "single" in your query likely refers to this specific attachment.

Function and Benefits: The tool is designed to offer several benefits for the skin:

Reduces Puffiness: The cooling effect of the stone, especially if refrigerated before use, helps to reduce swelling and puffiness, particularly around the eyes.

Reduces Dark Circles: By promoting better circulation and lymphatic drainage, it can help to diminish the appearance of dark circles.

Firms and Tones Skin: The vibrating technology combined with the rolling motion is said to help stimulate blood circulation and promote collagen production, which can improve skin firmness and tone.

Aids Product Absorption: Using the roller after applying serums or moisturizers can help the products penetrate deeper into the skin.

Reduces Fine Lines: With consistent use, it can help to reduce the appearance of fine lines and wrinkles.