Seems like a low-cost ($169) lightweight 11 speed cassette, but I’m not sure the shifting quality will be as good as the SRAM/Shimano alternatives. I searched for reviews but couldn’t find much.
SRAM Red 11-32: 196g | 11-12-13-14-15-17-19-22-25-28-32
Edco Monoblock 11-32: 214g | 11-12-13-14-15-16-18-21-24-28-32
Shimano Ultegra 11-32: 292g | 11-12-13-14-16-18-20-22-25-28-32
Shimano DA 11-30: 211g | 11-12-13-14-15-17-19-21-24-27-30
Just looked on their site. Trying to figure out why their 11-34 shimano 11-speed cassette is 103 grams heavier than the 11-34 shimano 12-speed cassette? Doesn’t make any sense.
elevenspeed = [11,13,15,17,19,21,23,25,28,30,34]
twelvespeed = [11,12,13,14,15,17,19,21,24,27,30,34]
elevenspeed.map(x=>x/2).map(x=>x**2).reduce((a,b)=>(a+b), 0) // 1400
twelvespeed.map(x=>x/2).map(x=>x**2).reduce((a,b)=>(a+b), 0) // 1326.75
Seems odd but could be possible, w/ a rough estimate it looks like the 12 speed cassette does have less material due to smaller jumps between high gears (more small cogs vs large cogs).
Can’t really tell much of a difference to Ultegra. Initially in the stand shifting was poor. Installed a 1mm spacer which came with the cassette. Improved everything. Optimal chanline seemed to be off a tiny bit. Perhaps it shifts a tad slower than Ultegra but this is difficult to tell. Out riding you can’t really tell a difference. At least with my set-up.