Inter-tracheid and cross-filed pit pairs in compression and opposite wood of Norway spruce (Picea abies) were examined. The size. appearance. and frequency of bordered pits on the radial side of axial tracheids and their aperture specification were studied. https://www.roneverhart.com/Heel-Elbow-Protectors-Premium-Heel-Elbow-Protector-Blue-Medium-Pair-66053/