The 9120M design includes an optional backrest (sold separately) for those players that desire more support, while the 9100M incorporates a more traditional seat top.
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The 9120AL design includes an optional backrest (sold separately) for those players that desire more support, while the 9100AL incorporates a more traditional seat top.
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The 9120AL design includes an optional backrest (sold separately) for those players that desire more support, while the 9100AL incorporates a more traditional seat top.
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