Blue wig block tape is great to use when ventilating a wig or hairpiece using transparent or invisible lace.  The tape is flexible and made with professional grade vinyl.  The tape will easily conform to the shape of your wig block, leaving not lumps or bumps during the ventilating process.  
 
The blue color will help block the reflection of light and will help you to view thin material easier.  The vinly material is flame retardant and resistant against water, solvents and other chemicals.