Masters Choice Blocks contain 20 sheets of 300gsm acid free, 100% cotton paper and are available in smooth, medium and rough surface textures. They are sized with natural gelatine and are a natural white with no optical bleaches used during manufacture. Exclusively hand-tested by many of Australia’s leading watercolour artists it delivers superior results that outshine the previous leading brands. These artists endorse and use this exciting paper development for all watercolour artists.