Schematic for a venomous lash

A hastily-scrawled diagram on the back of a manila envelope, showing the construction of a makeshift weapon. 
It tells you how to make a venomous lash with the following components: 
==Components==
*1 zombie hide
*3 venom sacs
You realize you could make this without needing a workbench. 
Making this would take decent familiarity with craft and decent familiarity with whip.