Scatter diagram of width against thickness/width of Levallois flakes, retouched ‘core-like’ pieces and retouched flakes from ‘core-like’ pieces.

Levallois flakes are thin blanks whose size variations are proportional (their thickness/width ratio varies little). Negative or positive blanks from the ‘core-like’ production system are thicker (nearly as thick as wide for heavily retouched ones) but much more variable in size.