I have a pretty good memory - sometimes it scares me. Peavey expanded their operations to acoustic drums in the mid 90s with the introduction to what they called the "Radial Bridge". From what I remember reading the literature when they were new (circa Fall 1994), the "Radial Bridge" are donut-shaped, cross-laminated maple "bridges" found at both the top and bottom of the drum, right next to the rims. That is a signature component of the "Radial Bridge" concept and was designed to replace traditional lugs, which are fastened to the shell and, consequently, interfere with the drum's natural resonance.
Needless to say, they were discontinued sometime in 2002.