Available Sizes are Red Carboxylated: 10 nm, 20 nm, 30 nm, 40 nm, 50 nm, 60 nm, 70 nm, 100 nm, 140 nm and Green Carboxylated: 70 nm, 90 nm, 120 nm, 140 nm. Please contact us with your requested sizes. Only one sample of each size per order.
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