I have extremely sensitive eyes so I rarely wear mascara. I hate the thought of using an old mascara that’s been sitting for a year and possibly growing bacteria that was picked up from my lashes when the wand was reinserted.I bought these to use exclusively with a brand new mascara tube. Insert once, use and discard. Hopefully the mascara will stay without contamination.So far I like the way the wand works with my choice of mascara, it may just be the mascara brand, but one wand held enough mascara on one dip to do both of my eyes. (I don’t generally use much mascara)