The basics Senna Form-A-Brow® Stencils let you create perfectly arched eyebrows with ease. The benefits Perfect as replacements when your Senna Form-A-Brow® kit stencils wear out or go missing.  The uses Ideal for creating shape on over-tweezed, sparse, faint, or thinning brows. Also makes a great guide to prevent over-tweezing and when growing out brows. To use Form-A-Brow® stencil: Use a stencil and a dark Powder Brow color to heavily color in the brow shape on top of your brow. Remove the stencil and tweeze the hairs outside of the stenciled shape. Remove the powder to reveal the perfectly shaped brow! The bottom line Form-A-Brow® stencils create perfect, classic brows in a minute.