Balloon stamp and tabs

Very nice stamp from Spain. Issued 22th March 2006. It is a serie of sports who are on the edge of the nonpossible. That is a TV program in Spain. How to collect these stamps and tabs. Do we call them tabs or cinderella? One stamp and 3 ???. It is good that you have to pay € 0,28 for this nice block. Also gives a nice picture. They where on a very nice cover with also some more of these kind. On the € 0,29 stamp you see moutainbikers on the Pyrenees, very nice if you collect bikes...