Used by two-time World Champion Dane Morales, Mini Hollow stems are cold forged from the highest quality 6061-T6 aluminum. They also feature an open skeletal design and single mid-bolt wedge mounting system, making them among the lightest weight mini stems on the market. A 40-millimeter extension stem weighs just 132 grams grams/4.6 ounces. Used by two-time World Champion Dane Morales, Mini Hollow stems are cold forged from the highest quality 6061-T6 aluminum. They also feature an open skeletal design and single mid-bolt wedge mounting system, making them among the lightest weight mini stems on the market. A 40-millimeter extension stem weighs just 132 grams grams/4.6 ounces. The Mini Hollow stems have a single-bolt wedge clamp, meaning there is no rear-facing pinch bolts to injure the rider's knees. They come with a 40- or 45-millimeter extension. To ensure proper clamping force, the stem must be mounted on a fork with at least 28 millimeters of exposed steerer tube. Available in anodized red, blue, gold and black with laser-etched graphics and five hollow chromoly Allen bolts. Meets or exceeds ENBMX Category 2 standards. Fits 22.2 � handlebars. Not compatible with carbon fiber steerer tube forks. single-bolt wedge clamp 6061-T6 aluminum 40mm-BX-ST1401N40 132 grams/4.6 ounces open skeletal design Not compatible with carbon fiber steerer tube forks