The F2 was created for mid to high end Road and Mountain Bikes. It has an oval shape for increased resistance to twisting forces and is a flip flop stem. One angle will provide +7 degree rise. Flip it over and you'll get -7 degree rise. It was specifically designed with carbon fiber handlebars in mind, though alloy bars work perfectly well, too. Performance minded riders will appreciate ATS’ micro adjustability. SPEC + / – 7 degree rise Cold forged Color: Sand Blast Black / High Polish Black / High Polish Silver Laser engraved logos Single stem bolt for quick and easy adjustment Features rear window to gauge height adjustment 31. 8mm bar bore clamp Stem weight: 80mm: 122 grams, 100mm: 140 grams Lengths (mm): 50/60/70/80/90/100/110/120/130