... are many kinds for ear plug,such as in-ear ear plug,stereo ear plug,MP3 ear plug,mobile phone ear plug etc3.Different size and colors are available,custom ... required.5.Ear plug with light weight for outstanding wearing comfortable and ergonomic design. Usage:1.This kind of ear plug is ... trains,buses etc2.Silicone ear plug is so soft,comfortable to wear in our ear,cancel voice and increase the quality ...