These coins look very nice. But, why Monero??? 
Because Monero is *the* best-of-breed altcoin.
For one thing, it's already 100% fungible at both protocol and socioeconomic levels, thanks to Science®.
For another, it has a vibrant dev/supporter ecosystem.
I could go on, but will instead invite you to pursue the links in my sig.
Welcome to Monero Mountain!
Bitcoin is fungible. Litecoin is fungible. 
I wanted smoothie to answer, not a Monero mouthpiece/bull. Were you paid to create this physical coin for Monero? Or, was this a deep, personal interest into Monero? If this was a Bitcoin coin, I would not hesitate to buy this. But, because it's Monero...
I can't imagine someone paying me to create physical coins, otherwise they would just make them themselves. No one has paid me to create these coins.
One reason I made these is because monero offers true fungibility. Bitcoin as well as litecoin offer pseudo-fungibility. You can still trace the history of where their respective "coins" came from. A biproduct of my coins is that they offer a physical form of allowing others to understand and learn about certain cryptocurrencies. In a sense it is a tool for marketing and teaching. My coin's in my opinion are not investments but collectible tokens (aka conversation pieces).
Monero has privacy features on by default and it is actively developed.
The math behind monero based on my own personal research is very sound. It incorporates sound elliptic curve math that Daniel J. Burnstein has been credited for.
Another reason I created these is that I enjoy art. Monero is a form of art and I like shiney silver coins. So I figured it would be appropriate to intertwine the two (monero art, and my art) into one.
Sound crypto + sound money + sound math + pretty art = these coins (all in my opinion).
I hope that answers your question.
