... is made of 100%silicone, eco-friendly,nontoxic,soft.2.There are many kinds for ear plug,such ... ,trains,buses etc2.Silicone ear plug is so soft,comfortable to wear in our ear,cancel voice ... and hearing protection. Non-toxic,smooth, dirt resistant soft flanges offer a better fit in the ear canal ... with a tighter seal and better attenuation for decreasing noise. Easy clean ...