What do you mean?I love the decal. Not to sure about the shape. Just got some decal paper myself for my first try. Looks great!
The decal is on the tube, so the ends are the same size as the center.If is was just the decal that cracked it was likely because it was trying to bend in 2 directions at once. Around the pen and then another because the ends are smaller than the center. Decal paper doesn't like that.