From what I remember, both the hard & soft plastic are an identical 2 part plastic, possibly PVC. What makes them hard or soft depends on how much of part A mixes with part B.
As to why they use it for each application, *shrugs*
<font color="#cd6600" size="1">[ February 14, 2005 11:46 AM: Message edited by: Figment? ]</font>
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