The measurements given are for the largest square area, Some of the fabric has been cut into, so the measurements represent the smallest working area you will have, but each piece actually contains a fair bit more in reality
navy cotton velvet 57 x 38cm
beige stretch velvet 35cm x 102cm
gold stretch velvet 52cm x 31cm + 65 x 18cm
White stretch velvet (slight pale pink marks in some areas 38cm x 103cm