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The two types may be identified by comparing their edges. Fold the webbing in half and align the selvage edges. They should be identical in weave. If they are, then it is shuttle weave and acceptable for use. If they are not, then it is needle weave. 

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One should never be substituted for the other in a repair. The rigger should have material certification and lot tractability for any materials used in the repair. The material certification should additionally identify the type. [Figures 3-17 through  3-32] 

