Natural Pink Sheet [TC (D) 208] Available in rolls of pink rubber. Very Soft and gives fine detail. Biscuit Sheet TC [(D) 709] Available in rolls of yellow rubber is cheaper than pink sheet and firmer. Yellow Rubber Available sheets and Strips. The cheapest rubber and most widely used. Silicon Silicon Rubber Roll Available in rolls or colour Yellow, Blue and Pink. White/orange/yellow Silicon Strip Available in strips and pack in 2 kgs. Cheapest of all.