Soyee’s PLA filter has patented technology. This is the first time that PLA polylactic acid bio-based material has been applied to e-cigarette products. As an environmentally friendly, safe, green and degradable natural material, PLA can be recycled in nature and is unanimously recognized by the industry as the most promising new green "ecological material". It is non-toxic and harmless after burning, and is as safe as edible food. After being made into a filter, it can effectively filter formaldehyde, heavy metals and other substances produced after high-temperature atomization of e-liquid, trap smoke particle molecules and condensate, and give consumers a more pleasant, comfortable and safer experience.