MONDO heads come in SKYNDEEP. All heads come with a high collar and utilized a straight-wall ACOUSTICO construction with a 1/2" support rim around the outside bottom for mounting with a tension ring.HistoryIn 1992 the MONDO drumhead introduced a new era of innovative drumhead manufacturing, increasing the possibilities for Remo World Percussion. Mondo (Italian for "world") drumheads are created using PTS® (Pre-Tuned System) technology which was created in 1980. This ground braking innovation advanced the world percussion manufacturing possibilities decades ahead of the drum industry. Made in USA.