Ring-Blades

Ring-Blades are items that appear in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. Ring-Blades are a pair of blue-colored rings that, upon the user's will, can be activated to trigger blades. Only a pair were created by Dr. Ellidy, who gave the weapons to Sally Acorn.

History
The Ring-Blades were given to Sally Acorn years after Dr. Ellidy retired from the Kingdom of Acorn, which was the "first time [they've] heard from him in years." She would then utilize the weapons to defeat Dr. Eggman's forces from time to time. Sally would use the Ring-Blades to subdue Metal Sonic shortly before the beginning of the Shattered World Crisis. She would then use the Ring-Blades again to rescue Charles the Hedgehog and Professor Dillon Pickle, who were captured E-106 Eta for Eggman's own purposes. She would then use the Ring-Blades to defeat badniks located on an undisclosed location near the Crystal Cave after retrieving a Chaos Emerald. During an attempt to slay E-113 Xi at the Rocky Jungle Zone in Soumerca, Sally used her Ring-Blades to ambush the robot, but failed due to the robot tracking her and Amy Rose down. She would then use them again to steal a Chaos Emerald from Eggman at the Sand Hill Zone, but failed due to the threats of not only three E-100 Series robots (E-108 Iota, E-109 Kappa, and E-110 Lambda), but also from the Capsule that contained the emerald, which had robotic limbs that attacked anyone attempting to steal the emerald.

Trivia

 * The Ring-Blades were first hinted as Sally's new weapons way back in Sonic the Hedgehog #234, when Dr. Eggman had upgraded the past-timeline form of Sally (who was roboticized into "Mecha Sally" in Sonic the Hedgehog #230). Mecha Sally was gifted blue-holographic blades that she could use to slice her opponents or obstacles, exactly like how the Ring-Blades are used.