Material: titanium alloy TC4 solid rod+memory rebound sponge (S/M/L three diameter specifications) Specification of titanium metal: 17.6mm in total length, 6.8mm in diameter, 1.8g in weight Memory sponge diameter: S green 10.5mm, M yellow 12mm, L red 13mm Attached: anti loss rope+plastic box Directions for use: Pick an earplug of appropriate caliber, lift the ear and slide it directly into the ear canal, or flatten and roll it into the ear canal. Features: We have tested many kinds of earplug materials and shapes, because it is important to protect your hearing and mood. This earplug is not an ordinary cheap silicone or foam earplug, but a titanium metal+memory foam earplug. It is made of dual materials combined with noise reduction and sound insulation. Its appearance and contour fit the ear canal. It is as convenient to replace earplugs of different calibers as earphones (both adults and children can use it). The titanium+sponge double isolation function can reduce the noise in all frequency bands to a safe level on average. At low frequencies, bones transmit sound, and the experience is better (traditional sound insulation earplugs only solve middle and high frequency noise, but low and deep noise has never been solved). They can isolate the noise penetration, and can also communicate normally when wearing earplugs. They are suitable for wearing for a long time to protect hearing. Improve the quality of rest and sleep, reduce the noise pollution in transportation, airplane, train, industrial workshop, nightclub, bar and life, and keep your concentration when you are studying and working.

??Package include: 1 Pair of titanium sound insulating rod bodies, 1 Anti loss rope, 4 Storage box, S/M/L 3 pairs of earplugs. ??It can improve the quality of rest and sleep, reduce the noise pollution in traffic, aircraft, trains, industrial workshops, nightclubs, bars, and daily life, isolate the penetration of noise, and enable normal communication even with earplugs. It is suitable for wearing earplugs to protect hearing for a long time. It can also keep your concentration when you are studying and working. ??The titanium+sponge double isolation function can reduce the noise in all frequency bands to a safe level on average. At low frequencies, bones transmit sound, and the experience is better (traditional sound insulation earplugs only solve the middle and high frequency noise, and the low frequency rumble and deep noise has never been solved). ??Traditional foam earplugs or multi-layer mushroom earplugs attenuate sound by absorbing noise. The correct way is to "isolate" and "block". Titanium metal has a good effect of "isolating" noise. You should not hear any direct sound from your ears. It is scientific that you can only hear the sound transmitted by bones!. ??Material: titanium alloy TC4 solid rod+Memory rebound sponge (S/M/L three diameter specifications).