Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh

 

The Hadith of the Prophet (peace be upon him) that if a skin is dyed it becomes pure. Many scholars referred this Hadith only to the original lawful animal like sheep and goat. But other scholars said, since the Hadith did not specify, then the process of dyeing a skin should produce pure material even if the skin was of a pig.

 

To these scholars, you can use leather made from pigs for it became pure in the process of dying.

I say, if you can buy known leather material not made from pigs it is better indeed.

 

Almighty Allah knows best.