Unless you have blackheads the size of barnacles, don't even bother with these. They are well made (hence the one star), but for what purpose?
Perseverence with these tortuous instruments would only result in redness, soreness and broken veins. They would look more at home in a dental surgery. If your blackheads are any less than 5mm diameter, you'd be better off steaming your face, and using a good face mask. It would be a whole lot less painful too!