The LF gage is intended for use on materials with relatively low stiffness (low Young's modulus), such as wood. To avoid unwanted localized reinforcement of the strain zone by the gage, the LF has an especially compliant backing material.  
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LF Series - Low Modulus Materials
Gage
Pattern		 Sensing
Element
Length
(mm)		 Sensing
Element
Width
(mm)		 Backing
Length
(mm)		 Backing Width
(mm)		 Resistance Ω
LFLAB-10 10 3.1 18.5 5.3 120
Single Axis
More information on the LF series
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