A composite composition comprising a polymeric resin; n organoclay compositions where a phyllosilicate clay is exchanged with quaternary ammonium ions having a formula of NR1R2R3R4+ wherein at least one of R1, R2 and R3 is a mixture of branched alkyl groups. An allocation system provides for monitoring of engagement metrics of listeners, including such metrics as percent of podcast consumed, frequency of consumption, whether the podcast is regularly listened to during a daily commute, and other signs of engagement with the content. The transducer arrays emit sound waves into non-overlapping segments of water, reflected by the underwater floor back to the transducer arrays, which convert them to electrical signals. Furthermore, there may be attached to the core a covering plate made of a plastic material with greater density than the foamed plastic envelop and the covering plate may be enclosed by foamed plastic by means of moulding.