Brand: Sumc

Model: Sumc SX12SL 126 Links 12 Speed Rainbow series

Selection of high-quality materials makes riding safer and more reliable, and improves durability.

Super light weight 

12 speed 126 Links chain
1/2''*11/128''

pls note:

If you choose "Only 1 BOX Quick-link(2 Pairs)" that it doesn't includes chain.
If you choose  chain that it includes chain+box + 1 pair quick-link

            
Classical Fast- Shifting Consturstion
            
As for the construction itself, SUMC employs a double X-construction with inner and outer plate chamfering to deliver smooth and fast shifting across the entire cassette.
            

Perfectly compatible with KMC ,SHIMANO, Campagnolo, Sram and other drivetrain systems
Feature:

Chain for smooth, precise shifting and long wear life Ti-Nitride coating reduces friction and improves durability X-shaped designed with inner & outer chamfering offers smooth, fast shifting Mushroom riveted pins aslo provides excellent pin power.

Quick Connector link allows simple installation and adjustments Compatible with all popular mountain and road drivetra