The two in the photo look different, but are actually exactly the same. (The product is sold as a single piece.) [Transmotif" is a silver accessory that changes its shape depending on the angle you look at it, based on the principle of illusion. [04M] is a round ring that transforms into a square ring. The smallest inner diameter is about size 15, but due to its odd shape, it is about size 17 or 18. Depending on the direction of the ring on the finger, it looks like a mountain, valley, or wave-shaped ring, and you can enjoy the change when you turn it. It can also be worn as a necklace by attaching a string or chain (string or chain not included). (The string or chain is not included.) ・Different from ordinary round rings, this ring can be worn as a necklace. Unlike normal round rings, the size cannot be adjusted. The picture in the box is for [05S], but the package is the same. The photo of engraving is for [05M], but it has the same engraving. [Made in Japan] TRANSMOTIF is the world first illlusional accessory that transforms the shape correspond with the view angle. It is developed by Dr. Kokichi SUGIHARA, Meiji Univ. who is the world champion of The Best Illusion of the Year Contest. [04M] is a simple TRANSMOTIF ring which changes from Circle to Square. Japan Standard approx. #17- #18 size (Men's size), made of Silver925, matte finish, NO coating/plating, MADE IN JAPAN