Made of high quality glass, the tubes are sanitary and safe to use. Special for absorbing the deeply embedded dirt, grease and other impurities. Never Try To Pick Or Squeeze Spots As It Bruises The Skin And May Cause Scarring. The Correct Time To Remove Blackheads Is Immediately After Shower Or Use Warm Face Towel For About 1-2 Minutes As The Steam Opens Up Pores. To Minimize Damage To Your Skin This Is An Effective Way To Remove Blackheads, Simply Place The Loop End Over The Top Of The Blackhead And Gently Press, It Should Just Pop Out Easily..syi