There is no .PNG attached!!??

When I opened the attached .psd it appeared red, not like in the picture. :/ 

The red layer seems to be just for demonstration of the transparency. Hiding the black background layer as well as "layer 1" under the bubble group is all it takes to replicate the preview image.

Thank you for the materials. Just wanna let you know that I use it in my e-book: How I get Tricked By Unity (On Amazon). I have provided a link in the book to this asset. I purposely register this account to say thanks.