Perspi guard rock 100 natural deodorant is made from potassium alum crystal that is naturally occurring sulphate mineral as potassium alum is an antiseptic as well as an astringent it helps prevent bacterial growth that causes body odour handy size for easy travels it is a perfect size to tuck into a handbag or gym bag making it a perfect companion for travels it is also easy to use simply moisten the rock and apply to the skin