EK-Quantum Torque Color Ring 10-Pack STC 10/13 - Silver 3831109906248 EK-Quantum Torque Color Ring 10-Pack STC 10/13 - Silver is an interchangeable aesthetic ring pack for EK-Quantum Torque minimalistic 10/13mm soft-tube compression fittings designed for use with 10/13mm ID/OD soft tubing. These aesthetic rings are made of anodized aluminum. The colored rings are available in many colors and are screwed onto the fitting before the compression locking ring. These accent rings are guaranteed to be compatible only with EK-Quantum Torque STC 10/13 fittings. Specifications: Material / Design / Color option Silver Threads G1/4