Oh my, the onahip made after Natsu no Himegoto, one of my fav 3D hentai. You HAVE to tell me how it feels ლ(´ڡ`ლ)
Couldn't find info about the maker, it's not in the 30 first AmazonJP pages. Anyway.
From the looks of it and knowing almost all onaholes I ever had are made in it, I guess that this onahole is made of TPE (thermoplastic elastomer). This material doesn't endure much heat, so be careful when using an onahole warmer, and don't dry it with hair dryer. Avoid exposing it to direct sunlight. It can get slightly oily, that's normal. You can use corn starch powder to make the surface dry and smooth like a baby's skin.
Use only water based lubricant: no oils, no vaseline, probably no silicone lube. Clean and dry well after each use, this can be a bit difficult with large onaholes like this one: don't be shy to stick your fingers inside to make sure it's clean and dry deep. If there's water remaining, mold can grow over time. It's not a bad idea to use hydrogen peroxide from time to time to make sure there's no bacteria and stuff.
TPE is safe "unless proven otherwise", and in my experience I had only one physical issue with onaholes during my almost daily use for 4 years: https://blog.onahole.eu/onaholes-sometimes-a-risky-hobby.html
Maybe I get penis cancer in 30 years but I really doubt it ^^ Some makers like ToysHeat achieves medical-grade certifications for their onaholes.
Here's more to read: https://blog.onahole.eu/about