Klix concealer/foundation brush replacement heads are 100% recyclable and come with cruelty-free, white hair bristles, allowing you to see any dirt build up and reminding you when it is time to throw away your old brush head and start fresh. Full, soft heads that click into your Klix concealer/foundation brush handle for a clean, new, brush head. This package includes a set of two so you always have a clean brush head ready to go. Klix recommends a new Klix brush head every 30 days. Klix Makeup Brushes. Introducing an incredible line of makeup brushes with never before seen, one-touch release, replaceable brush head technology. No washing or dr.