glass clad and sand filled. Might even make them sound interesting! 
Could well liven them up a bit if there isn't too much sand ballast in there.
http://www.ebay.co.uk/itm/speakers-spendor-sp2-2-glass-clad-unique-black-sand-filled-/221251619176?pt=UK_AudioVideoElectronics_HomeAudioHiFi_HiFiSpeakers&hash=item33839fc968
look lovely, imo - pop round for a listen if you are local to Selby!
Could well liven them up a bit if there isn't too much sand ballast in there.http://www.ebay.co.uk/itm/speakers-spendor-sp2-2-glass-clad-unique-black-sand-filled-/221251619176?pt=UK_AudioVideoElectronics_HomeAudioHiFi_HiFiSpeakers&hash=item33839fc968
look lovely, imo - pop round for a listen if you are local to Selby!
