Zhè zhǒng làqiāngtóu chǎnpǐn, yàngzi hǎokàn què bù nàiyòng.
This kind of 'pewter spearhead' product looks great but doesn't hold up.
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閖 is a variant of 镴 (pewter, a tin-lead alloy that looks like silver). The full saying 银样閖槍头 appears in 《西游记》 and 《红楼梦》 to mock things that glitter like silver but crumple on contact.