... 3, click pen, lip gloss pen, etc. Specifications1.easy to use and portable 2.favorable price. 3.available for ... logo print.The main ingredients of the pen is a kind of peroxide,hydrogen peroxide or carbamide peroxide ... or non peroxide. any concentration of 2ml, 4ml, any ml,hp, cp or non ... .to use the pen, just twist the bottom of the the pen to release some gel onto the ...