Measure the diameter of your tube. Cut out the cone, as accurately as possible on the inner side. Cut a rectangle of yellow paper for the tube.
Put glue on the rectangle and wrap it around the roll tube. Put some glue on the tab of the cone semicircle, bend round and stick the two ends together to make the cone.
Take the tube and make little vertical cuts around on end about 1cm long. Slot the tube into the cone. Use sticky tape to fix in place. Cover the join with gold tape.
To make the handle, take a strip of yellow paper about 12cm long and 4.5 cm wide. Fold the strips at each end bend it into a curve, and then fix the handle onto the tube with tape.
Finish off by adding stickers for the keys and have fun playing your trumpet!