Soft brush (black) for Twin Brush (9708692). The Twin Brush (9708692) is compatible with 3 different brushes; soft (black) (9708694), medium (blue) (9708695), hard (red) (9708696). The soft brush is used for surfaces such as: caravans & boats. The medium brush is used for surfaces such as: caravans, houses, boats, swimming pools, tiles & (wooden) decks. The hard brush is used for surfaces such as: caravans, bathrooms, swimming pools, tiles & (wooden) decks. Product description: Soft brush for the 18V Twin Brush. The Twin Brush is compatible with 3 different brushes; soft (black), medium (blue), and hard (red). The soft brush is used for surfaces such as: caravans & boats. The medium brush is used for surfaces such as: caravans, houses, boats, swimming pools, tiles & (wooden) decks. The hard brush is used for surfaces such as: caravans, bathrooms, swimming pools, tiles & (wooden) decks.