Sennheiser Momentum Wireless vs Sennheiser PX 100-IIi: What is the difference?
PX-100 by ol' mate Kossy : r/headphones
Geekria Protein Leather Headband Pad Compatible with Sennheiser PX100, PX200, PX80 Headphone Replacement Headband/Headband Cushion/Replacement Pad Repair Parts (Black).