Stamperia Shrinky Bits A4 Transparent (18 ratings) £1.99 Quantity: at £1.99 each Add To Basket Shrinky Bits A4 transparent heat-shrinkable sheet. 1. Gently sand the Shrinky Bits to make the paint stick better. 2. Decorate with permanent inks and Aquacolor. 3. Cut out the decoration and warm it (heat tool, or in the oven at 140 degrees for approx. 3 mins) The decoration will shrink around 60%. It can be modeled when warm.