I believe the ones he purchased (and are only on sale) on ebay are the mono/poly-crystaline type that come in small plates (generally 2"x3" or 2"x2", but they come in all sorts of sizes). They are not flexible at all, in fact, the Mono are the most delicate (yet most efficient) and crack easily. Polycrystaline are more durable (not as efficient) and Amorphous are the most durable (but least efficient).
If you want a flexible cell, you need to look into the Amorphous types. However, these are the lease efficient type of solar cell available.
Mono = Best
Poly = Better
Amorphous = Good
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