BRAND NEW, NEVER OPENED ** Dermatologists recommend that makeup brushes and accessories should be cleaned at least every few days, since they provide a breeding ground for acne if unwashed. With this brush cleaner, you can effectively remove 99% of the dirty material and residue from the brushes, preventing skin problems. ** Simply fit your chosen brush into the best-fitting collar, attach it to the spinner and you’re good to go. ** 13 specially customized rubber collars (3mm, 5mm, 7mm, 10mm, 12mm, 14mm, 15mm, 17mm, 18mm, 20mm, 22mm, 24mm, 30mm) - Compatible with more cosmetic makeup brushes, compared to other brands in the market.