Seishin ōkami tamashī bunkatsu

The Seishin ōkami no tamashī no bunkatsu (精神狼の魂の分割, Spirit Wolves Soul Split) is a legendary elemental weapons forged from a legendary wolf spirit. They take the form of seven rings, all which represent different elements.

Overview
There are seven rings overall. They all bear a different color, namely yellow, green, red, blue, dark blue, purple and orange, all which represent a different element.

Yellow

 * Main Article - Taiyō Ringu

Green

 * Main Article - Raitoningu Ringu

Red

 * Main Article - Arashi Ringu

Blue

 * Main Article - Akua Ringu 

Dark Blue

 * Main Article - Misuto Ringu

Purple

 * Main Article - Kumo Ringu

Behind The Scenes
This was greatly based off of the seven vongola rings in Katekyo Hitman Reborn.
 * Main Article - Urufu Fureimu Ringu