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Table 1 Needles measures and characteristics

From: TMA for all: a new method for the construction of tissue microarrays without recipient paraffin block using custom-built needles

External diameter Hub color Internal diameter Core area (mm2)
Gauge Millimeter   Inches Millimeter  
16 G1 1/2 1,60 × 40 white 0.047 1,19 1,1
18 G1 1/2 1,20 × 40 pink 0.033 0,83 0,53
21 G1 1/4 0,80 × 30 green 0.020 0,5 0,2