i found a little info from
parts express......
Butyl rubber surrounds are superior to foam in two important ways. First, the butyl rubber resists moisture and will not dry rot, prividing years of service. Second, the rubber surround, due to its superior damping characteristics will greatly reduce cone break up and ensure low distortion. These woofers are ideal for replacing and upgrading old, worn out drivers. They all feature a polypropylene cone, vented pole piece, foam gasket, soft poly dust cap, and stamped steel frame.
Specifications: *Power handling: 60 watts RMS/85 watts max *VCdia: 1-1/2" *Le: .26 mH *Impedance: 8 ohms *Re: 7.30 ohms *Frequency range: 55-3,000 Hz *Fs: 58 Hz *SPL: 85 dB 1W/1m *Vas: .41 cu. ft. *Qms: 3.47 *Qes: 1.15 *Qts: .86 *Xmax: 4.4mm *Dimensions: Overall Diameter: 6-1/2", Cutout Diameter: 5-5/8", Mounting Depth: 3-1/4", Magnet Diameter: 4", Magnet Height: 1-1/4".
http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=290-350&CFID=5575134&CFTOKEN=68644722
i'm gonna throw them up in the FS thread nice and cheap
if anybody is interested
let me know if you are....or i'll just skip the thread