Pieces of hardboard (Woodley RG5)

Are these useful to anyone? 6 pieces of hardboard, which were the backs of clipframes. Banana is there to give some scale. There are 3 which measure about 11 and a 1/2ins by 9 and a 1/2; the others measure 10x8ins, 16x12ins and 11 and a 1/2 by 9 and a 1/2. Take any or all.