Snap button in the urging button and sewing button by the button surface (button surface plus flute composition) plus the bottom three components.
Four sets of names: A button face, B slingshot, C button beads, D straight flute (divided nipple flute and starter flute). The button surface is generally copper, iron or alloy material, but the bottom three are generally copper or iron.
The bottom three buttons are generally (from small to large) 489# (9MM slingshot), 488# (10MM slingshot), 486# (12.5MM slingshot), 484# (14MM slingshot), 805# (15MM slingshot).
For more information, please pay attention: China Button Industry Network
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