Treat your bike right with Park Tool’s Bike Cleaning Brush Set. The BCB 4. 2 offers you four different brushes that are designed specifically for bicycles: one soft bristle soaping brush, one frame cleaning dual-headed sponge/bristle brush, one tapered detailing brush, and one gear cleaning brush (the infamous GSC-1 brush). Park Tool’s ergonomic handles, dual-density grips, and reliable construction ensures that you’ll be using the BCB 4. 2 for a long, long time.