Bought these Womet-Tech Frame Sliders to replace my T-Rex Racing ones that were great, but the right side became loose after a good 7 years. I re-torqued the engine bolt and the frame slider is still loose, I couldn't figure out why and T-Rex no longer makes them for my bike. Womet-Tech Frame Sliders feel high quality and are similar in design to the T-Rex ones I have in terms of the bracket part, which is one of the reasons why I picked Womet-Tech over other competitors. I prefer the Puck design on the T-Rex Racing, because it was pretty beefy/thick, wide, slightly more protrusive, sort of like a mini chubby boomerang shape and it looked like it belonged there vs a typical cylinder/circular design. I like how Womet-Tech Frame sliders are independent between the bracket and the puck vs the T-Rex Racing's one-piece design. Over other competitors, I like the engineering and design of Womet_tech Frame Sliders best. Anyways, I'm a picky person and I'm very happy with my purchase. Install was easy and proper quick. I just followed the Youtube install on the site. Thank you TST Industries! Pros: Besides the features already mentioned on site; -High Quality -Simple and Precise install -Rigid and Stable -Puck is less protrusive than most competitors, less chance to flip the bike IMO. -Brace and Puck are independent, so if you need to replace the Puck, that's all you need to remove and not the entire assembly, which reduces the chance of damaging the threads or snapping the engine bolt. Cons: The Puck is less protrusive than most competitors, though I mentioned this as an advantage, it can also be a disadvantage when your bike goes down sliding at high speed, shaving a lot off the puck, and depending on how bad, it may shave off enough to the point where your bike starts to take more damages. Not that I've experienced this, but I've seen pictures of pucks half shaved off on bikes that went down sliding.