What material is this? i want to replace the leather headband of the hd 569 / 598 cs to a more comfortable foam one

It's a suede material. Really soft.

Before installing on headphones, Can it be safely washed in a front door/blade-less washing machine ? ( Even if it loses adhesive ) ?

I wouldn't. Hand wash and air or drip.deynis best. But, I wouldn't wash it if brand new.

Can the pad be removed without damaging the original headband cushion?

This Geekria headband pad may damage the original headband cushion. Here is another one that will not damage the original headband cushion: https://www.amazon.com/dp/B089ZNHR1S/

ASIN	B07VXFS3P2
Best Sellers Rank	#24,024 in Electronics ( See Top 100 in Electronics ) #779 in Headphone Earpads
Brand	GEEKRIA
Color	Black
Compatible Devices	Sennheiser HD598, HD598SE, HD598CS, HD595, HD569, HD559, HD558, HD555, HD518, HD515, Game ONE, PC360, PC363D, PC373D and more Compatible Devices Sennheiser HD598, HD598SE, HD598CS, HD595, HD569, HD559, HD558, HD555, HD518, HD515, Game ONE, PC360, PC363D, PC373D and more See more
Customer Reviews	4.1 out of 5 stars 460 Reviews
Enclosure Material	Velour
Item Dimensions	5.51 x 1.46 x 0.59 inches
Item Weight	9 Grams
Item dimensions L x W x H	5.51 x 1.46 x 0.59 inches
Manufacturer	GEEKRIA
Material	Velour
Unit Count	1.0 Count
Warranty Description	1 year manufacturer

Velour Headband Pad Compatible with Sennheiser HD 598/ 598SE/ 598CS/ 595/569/ 559/558/ 555/518/ 515, Game ONE, PC360, PC373D Headphones, Replacement Band Repair Part (Black)

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