Marco Raposo is a small Brazilian/American manufacturer of bows and other violin family products. I have been doing business with Marco Raposo for several years and have been pleased with the consistently excellent viola bows that I have received from them. One general characteristic I have noticed about their viola bows is that they tend to manufacture some of the dimensions of their sticks a bit thicker than some of their competitor's. In the end, it is about preference and I enjoy their stronger sticks, which tend to have a powerful tone.
Marco Raposo currently only offers two levels of bows: Nickel and Silver Mounted. They start off at a higher price point than some of the competitors.
Here is a general guide to the bows:
Nickel - Good quality, firm sticks - warmer sounding sticks- an excellent introduction the tone world of Pernambuco bows!
Silver - Denser and more stiff sticks than Nickel - more crispness to the bite in the sound - for the advanced player.