Liquid to Silk -- Close Up Magic,Silk Magic, Magic Trick-New Arrival

A cup of liquid and a cup are on the table.The magician pours the liquid
into the cup and turns the cup  upside down,what happens then?
The liquid does not spill out from the cup while a silk appearing !Unbelievable!

Notice:1 The color of the silk should be the same with the liquid.
       2 Any kind of liquid can be used in the performance.
       3 It is different from other glass cups in that it has special gimmick to stop the liquid from spilling out from the cup.
       4 Silk is not included.

The trick includes a special cup and online explanation.

Shipping the product has a dimensional weight: 0.13kg

The product actual weight: 0.09kg