Why is bigger ferrite core much cheaper?

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cupoftea

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Hi,
Why is the E70 ferrite core much cheaper than the much smaller PM6249?

E70 £10

PM6249 £22
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Also, do you know how to clamp the E70 core halves together?
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Also, why are their 2 formers in the below...one is for one core set, one is for 2 core sets.....do they mean literally 2 pairs of core halves in one former?
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Also do you understand on oage 4 of the below.....what is the winding width?
Its either 40.9mm or 32.3mm?
 
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Notice that PM62 core is purchased per set while E70 is purchased as piece (half set), prices per set are similar. Simple E core has probably higher production yield than complex PM type.
 
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Thanks, i confess i cant see where it says "set" or "pair" for the PM6249 link
 

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