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Why here are crossing stripes on the product sometimes?

Reflective material is always divided to squares (the material is on rolls); the square measure is approx. 225*225mm – this way the reflectivity quality is stable. Sometimes this square edge line could get on the product you buy but don't worry; this doesn't mean that the product is cull.
With slap wrap or other long products its even negative if the product doesn't have one or two of these lines on the product; in that case it doesn't apply to CE EN13356:2001