When it comes to training indoors, rollers are without equal in improving your spin, balance and form. Kreitler's whisper quiet and silky smooth rollers are the choice of those in the know. Kreitler drums are made from high quality aluminum, lathe-turned to within .002" for smoothness, and anodized for a long-lasting finish. They spin virtually without resistant on instrument quality bearings. 15" roller width. Fork stand (sold separately) allows you to add sprint workouts by stabilizing the front end. Alloy rollers with 4.5" drum and fan. Lifetime warranty.