Material：ABS（ ABS engineering plastic is not easy to deform, bendable and not easy to break when heated, easy to process, easy to cut, and has high impact toughness. Size：3mm 4mm 5mm 6mm 8mm 10mm. 3 3 250mm, outer size 3 3mm, length about 250mm, wall thickness 0.3mm, inner hole 2.4 2.4mm, single weight of about 1 gram.
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