The pizzle favoured by the Ronderos is quite a formidable implement, though they also use branches, nettles, and forced stripping as punishments.
A more light-hearted look at them:
https://www.youtube.com/watch?v=lhrmGKTuHPM
A more light-hearted look at them:
https://www.youtube.com/watch?v=lhrmGKTuHPM