Are these genuine Black 4 pack Phillips sonicare heads

Definitely are the real thing - I buy the black C3 ones - exactly the same as the ones you get in Boots but for twice as much - been buying these off Amazon for about two years now .

will this fit with my HX939W？

If you go on to Phillips site it tells you what toothbrushes and heads are comparable - yours is comparable with the C3 head that I bought - another problem solved 😜😜

Product Name	HX9042/33 REPL BH 2PK C3 PREM PLAQ BLK R
Volume	1 Centilitres
Units	2 count
Country of origin	Germany
Brand	Philips
Format	solid
Age Range Description	Adult

Philips Sonicare Original C3 Premium Plaque Defence Standard Sonic Toothbrush heads - 2 Pack in Black (Model HX9042/33)

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