Hollow stems are cold forged from the highest quality 6061-T6 aluminum available Featuring an open skeletal design and a dual mid-bolt wedge mounting system, they are lightweight yet maintain a very high level of strength By removing the rear pinch bolts and moving the mounting bolts to the middle of the stem, Box reduced the weight and size and eliminated a serious hazard to the rider`s knees 1-1/8` 53 22.2 +/-5? Blk AL6061-T6UPC/EAN/GTIN: 639266088127