Sûlrostur

Sûlrostur was a lesser ring of power, and mate to Aldarion's ring they were both presumably forged in the First Age--and possibly given by Finrod to Cirdan since they were close and his family was known to have rings. No doubt Cirdan received both Sûlrostur and Sulrosendil, but gave Sulrosendil to Aldarion in thanks for his aid.

Both rings allowed control over the wind of sails. Sûlrostur allowed for the bearer to control the mile per hour of wind per their level (70th LvL. Cirdan could make the wind 70mph), and the ring also allowed the number of ships per level to be effected by the "wind in the sails". So Cirdan could do 70 ships at a level 70. All ships had to be in eyesight.