Description 
The GCB90 is a GPU anti‑sag / support bracket. Its job is to prevent heavy graphics cards from drooping over time under their own weight.
It is made of aluminum alloy, which gives a nice strength / lightweight balance. 
It has ARGB lighting built in. You can connect it to a standard 5V 3‑pin ARGB header on your motherboard, so you can sync its lighting effects with your other ARGB hardware (motherboard, fans, etc.). 
The design is adjustable in both length and height so that it can accommodate different graphics card sizes. So even if your GPU is long or heavy, you can adjust the bracket so it supports appropriately.
To avoid scratching the GPU’s surfaces, the bracket has rubber grommets/pads at contact areas. This gives protection while it supports the card. 
It helps avoid GPU sag and warping — over time, if a card is heavy and unsupported, its PCB or heatsink may get bent. This bracket reduces that risk. 
The product is in white color (frame / bracket body) in this variant. There is also a black version.
Dimensions: about 28 × 5 × 75 cm. (This seems large — probably is the maximum adjustable size span; check to ensure your case has space. )
Weight: approximately 200 grams. So it's not very heavy, won’t add much burden. 
Warranty 
Warranty duration is 1 year from date of purchase.
The warranty covers manufacturing defects.
Not covered: damage due to misuse, physical damage, incorrect installation, etc. (Standard exclusions.)