6061-T6 aluminum top load stem from Subrosa. The High life is CNC'd from 6061-T6 alloy & has been machined to save weight whilst being wide for increased clamping power. The stem also features an increased handlebar rise over traditional topload stems & comes with oversized 6mm bolts. section Product Specs TYPE: Top Load REACH: 50mm RISE: 36mm CLAMPING DIAMETER: 22.2mm WEIGHT: 311g