Our eyelash filter separator combs contain plastic, stainless steel. It gently brushes open and unlocks eyelashes to help separate stuck lashes, while also removing all the tiny buildup. The way to apply it is simple: after applying mascara, wait 1 minute and use this product to carefully comb the lashes and filter out the caked residue of the lashes. This comb is suitable for different lengths and types of eyelashes, including synthetic, silk and mink lashes.