The box cost about $7.00. It comes with henna, a small pack of henna oil (olive oil) and gloves. On the website it says to mix the henna with cool water, 1/2 fresh lemon juice, the henna oil, in addition to coffee for brown tones or brewed tea for red tones. Also buy your own gloves.
I mixed the henna and let it sit for 3 hrs. After that I applied to my hair, and let it sit for another 3 hrs. I loved the results, the directions said to rinse the henna out first with plain water, and follow with shampoo and conditioner.
My grey strands had beautiful brown highlights, my hair felt stronger and thicker and wasn't dried out. I will definitely repurchase and do another treatment in a few weeks.