Parts & Extras

Black Ball Joint

Item: # 90940


Price: $0.08

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Black color Ball Joint - Used with Part Item #90945 (Ball Socket) to build Ball-Socket joints.

Currently, online instructions are not available for this set. For help building this set, please give us a call at 1-800-KID-KNEX (1-800-543-5639) or email us at

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Black Ball Joint

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