This Pro Arte Prolene Synthetic Brush Round Series 101 is one of Pro Arte’s incredibly popular Prolene brushes, made with synthetic polyester bristles specially developed so that they don’t become charged up with static electricity. This means that they behave like sable, while being more durable and significantly less expensive. They’re ideal if you’re looking for a value-for-money watercolour brush but don’t want to compromise on quality. The Series 101 is the round version of the Pro Arte Prolene Synthetic Brush. We sell it in a huge range of sizes to suit all purposes.