This product contains a spring. Each product consists of one spring and 20 power tubes.
S : 3mm / M : 4mm / L : 5mm
3mm(Head) and 4mm(Waist) are mainly used on the HG scale.
4mm(Head) and 5mm(Waist) are mainly used on the MG scale.
Still haven't taken the leap into properly placing into my HG-Zakus
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