Universal and Custom Earplugs Performance & Price Comparison

1270 Tree-Shaped Tri-Ring Universal Earplug Introduction
The old-style bullet-shaped foam earplugs must first be rolled into thin strips before inserted into the ear canal.

You can directly insert the new tree-shaped tri-ring earplugs into the ear canal without any rolling. Its large, medium, and small rings fit better with ear canals of different sizes and shapes than the foam earplugs. Therefore, the standard earplugs in most workplaces nowadays are the 1270 tree-shaped tri-ring earplugs.

Limitations of Wearing Universal Earplugs
Universal earplugs do not follow the bend of the ear canal; they can only fit in the small section of the ear canal between the canal opening to the first bend.  It is why the earplugs will eventually loosen and slide out.

Any universal earplugs can only fit a particular group of peoples' ear canals to obtain a good seal and decent noise isolation.

People with ear canals that do not fit well with the earplugs will only obtain intermittent noise isolation by frequently reinserting the earplugs. 

1270 Universal Earplugs & ACS PRO Custom Earplugs Comparison

1270 Universal Earplugs Wearing Simulation

No. 1 – Red Colored Blocks
Marking the areas where inward pressure pressed the earplug against the ear canal wall, forming a good seal that allows the earplug to achieve effective external noise isolation temporarily.

No. 2 – Yellow Dotted Earplug Outline
Marking the final position of the earplug after slipping out because of losing the inward pressure. The earplug is only partially in contact with the ear canal wall, so it cannot block the external noise and cause hearing damage.

Simulation of The 1270 Earplug Loosening

ACS PRO Custom Earplugs Wearing Simulation

No. 1 – The Earplug's Canal Tip Goes Deep & Hooks Over The Second Bend Of The Ear Canal.
The earplug forms a large area of tight contact with the ear canal wall, preventing any external sound from penetrating.

No. 2 – Custom Earplugs Have an Audio Duct Following The Shape of The Ear Canal
Only the sound that passes through the audio duct can enter the ear.

No. 3 – The Audio Duct's Entrance Has A Replaceable Filter
The filter will treat all the sound that passes through the audio duct.