NAMKON Road Rear Derailleur Cage Pulley Wheels for SHIMANO 11、12 speed UT/DA 105 Derailleur Super Short For R9250、R8150

I've been running one of these for a couple of months. It's well made and works well but it's not 24g. Mine saved me 19g compared to an RD-R8150 rear derailleur cage. If you can find one you'll save more by fitting a 2nd hand Dura Ace cage.