Answer: Working Stretch of these Retainers are: Size small: GL502 and 702 is 8 Medium: GL503 and 703 is 10-1/8 Large: GL504 and 704 is 12-1/4 Working Stretch of: GLLF2502 is 7 GLLF2503 is 9 GLLF2504 is 11
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