SinFive Eve is a leaf shape made from thermal plastic elastomer with a slot to slide in the accompanying bullet vibrator. This product is flexible, intended for external use, and is available in multiple colors.
Here is an excerpt taken from the Nymphomaniac Ness review of the SinFive Eve:
“When using Eve, I found that it can be used several ways. Eve fits perfectly to the contour of your hand, and with the flexible leaf you gain additional control on pressure when using it for general body massage. The raised ridges on the underside of Eve can be used to tease erogenous zones such as the nipples or clitoris.”