The Shusui is one of the 21 O Wazamono grade swords. It was once wielded by the samurai Ryuma, who appeared as a zombie on Thriller Bark, who had been given the shadow of Brook. After his defeat, Ryuma bequeathed the sword to Roronoa Zoro, and said he was satisfied with Zoro as the sword's master. The sword then replaced Zoro's Yubashiri which was destroyed at Enies Lobby.
The Wado Ichimonji is a sword of great personal importance to Roronoa Zoro, and it was once Kuina's and her family's sword. It is also one of the 21 O Wazamono grade swords. Upon Kuina's death, Zoro asked for it from her father. As one of the twenty one finest katana in the world, Wado Ichimonji is a powerful blade when used by a competent swordsman. It is also quite durable, as shown when Dracule Mihawk's Yoru shattered two of Zoro's swords, this is the only one that did not break at all.
The Yubashiri is one of the fifty Ryo Wazamono grade (called Skillfull Grade in the Viz edition) swords. Roronoa Zoro obtained this sword for free from a sword shop owner. The sword was a family heirloom and the best sword in the shop, in Loguetown. Ippon-Matsu gave it to Zoro after he saw the skill and courage that Zoro showed in testing the curse of Sandai Kitetsu. It was destroyed via rusting by Shu in the battle against the Marines's captains and commanders on the Bridge of Hesitation at Enies Lobby.