Mammut Boulder Brush Micro Wood One Size. The Boulder Brush Micro ensures that every crimp no matter how small is clean. Specifications for Mammut Boulder Brush Micro: Manufacturer: Mammut Size: One Size Color: Wood Features of Mammut Boulder Brush Micro Made in Germany Natural hair bristles FSC-certified wood Package Contents: Mammut Boulder Brush Micro Mammut 2290-00860-7369-1: Boulder Brush Micro Wood One Size Mammut 2290-00860-7369-1: Boulder Brush Micro Wood One Size