HDI drums with TE3.2 patented triggering systems represent the most advanced trigger and head technology available in the marketplace today. Patented TE3.2 drums utilize patented Kontrol Screen drum heads for incredible "feel" which is as close to an acoustic drum as it gets. All drums have unsurpassed triggering characteristics, as well as very quiet stick attack and dual trigger capability. TE3.2 drums come stock with Kontrol Screen Magnum "mesh" heads, but our unique trigger system allows you to use any drum heads you prefer, even Mylar (acoustic drum heads). HDI TE3.2 Transparent Energy Transfer trigger technology allows these drums to feel like there is nothing under the drum head, so you get the true "live" response of an acoustic drum. We have also eliminated the "hot spot" associated with electronic drums and our unique patented sensor plate protects the transducer, so you can play our drums as hard as you want for many years without transducer damage or loss of sensitivity. We even back this claim up with our Lifetime Guarantee! The problem with current trigger technology used in electronic drums is that many have a "slow" response time and "spikes" in the transducer output. What this means to the player is "clunky" response and uneven triggering. This causes notes to drop out when playing fast or hitting two separate drums at the same time. All HDI drums with TE3.2 trigger systems have the fastest, cleanest output envelope available which allows the drum to trigger with the fastest response time available, dynamics that are smooth as silk, and natural output response from the edge to the center of the drum. There really are no other electronic drums available that even come close. All TE3.2 patented drums come with replaceable rubber Rim Trim for suppressed rim-shot stick volume without a sacrifice in feel. Rim trim is also removable for those of you that prefer a metal rim. All ACUPAD II and HART PROFESSIONAL drums ship stock with TE3.2 patented trigger systems.. Fully compatible with all position sensing, modulation and dual trigger capable modules. These drums define