audio-technica. Audio-Technica hybrid insulator set. Includes: AT6099 (Large): 6 pieces AT6098 (Small): 8 pieces Purchased new and used under speakers. Of the AT6099 (Large), one has a missing urethane top surface, and one has a missing cushion on the bottom. The AT6098 (Small) have no missing parts. audio-technica insulator AT-6098 8 pieces audio-technica insulator AT-6099 6 pieces Structure: 3-layer hybrid structure (Hane-nite/Brass/Hane-nite) Please understand and purchase accordingly.