I was looking for a custom moldable earplug for my bluetooth. Everyone knows what the downside of using the earplugs that come with every bluetooth out there right? So I found this product. It is a 2 part putty much like epoxy, You knead equal parts together then mold it into the ear cavity. Well...after the material cures, the material is still pliable but it doesn't stay together and finally starts to crumble apart. I could not use this product for my intended use let alone for earplugs.the idea is great but I definitely would not recommend this product!