Procedural Polished Wood Shader Pack
The shader work on both EEVEE and Cycles render engine
Blender's new Mix node will not work on older version for blender

if use saved the downloaded blend file with blender version 3.4 or later and reopened the blend file in older version the mix node will be marked as undefined

there are 3 solutions
1. Redownload the blend file
2. update blender
Make sure the MixRGB nodes are looking good

If MixRGB nodes are masked undefined there are 3 solutions
1. Redownload the blend file
2. update blender
3. Replace the undefined nodes with MixRGB node
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