Size: 76mm x 45mm. Compatible Model: Thinkpad T400ST410S T420S T410Si T420Si T430S T430Si, Thinkpad T410 T410i T420 T420i, Thinkpad T430 T430I T510 T510i T520 T520i T530 T530i, Thinkpad W510 W520 W530.
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