Stamperia Shrinky Bits A4 White (17 ratings) £1.99 Quantity: at £1.99 each Add To Basket Shrinky Bits A4 white. 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.