Using the same principle as shumai filling, silk turns into a pig. However, the other pig for the switch has a squeaker built in, so please consider various configurations. Both pigs have a faint stain on their backs from the time of purchase. It doesn't come off even when wiped, so it may be a color from the silicone rubber manufacturing process. - Product Name: Silk to Pig - Author: Alan Wong - Color: Pink Thank you for viewing. #oshumai #Tenyo #Magic