Copper ions are said to have the following effects: ● Inhibition of slime and odor in drains, etc. ● Prevention of mosquito larvae ● Prevention of bacterial growth This is a circular piece made from the end pieces (unused) of copper pipes for air conditioners. It can be placed in water areas and used as a copper ion generator. This is a φ6.35mm copper pipe bent into a circle with a diameter of approximately 9cm. It is not copper plated, but made of copper with a purity of 99.90% or more. Since it is processed by hand, there are some variations in size and shape. (The first photo is the actual product, and the photos after the second one are representative images.) Please use it by submerging it in the drain trap as shown in the product image example. * Copper ions will not be generated unless it is submerged in water. The drain in the usage example was taken 14 years after construction, and has been using a copper ion generator for half a year. Although it does not completely prevent dirt from sticking, it can be easily cleaned with a light scrub, making cleaning easier. If the surface of the copper pipe gets dirty, please wipe it off. Since it is a relatively soft material, it can be processed to fit the drain pipe diameter and trap shape. * The burrs on the cut surface have been removed, but please be careful when processing. We are selling several of the same item, so if you need multiple items, please request a combined order, or let us know the number of pieces you need in the comment section, and we will adjust the price.