Biker Boots Boot Chains Black Topgrain Cowhide Leather with Cast Skulls Color: Black Leather with Silver Colored Hardware. Finely detailed metal skulls on Genuine Topgrain Leather Steel underchain for tight fit on any pair of biker or western boots. Dangerous Threads' Leather Belts (our Amazon-registered branded products) are manufactured according to our exact specifications, then carefully cut, packaged and shipped exclusively from our factory as shown. Dangerous Threads, Inc. has no other wholesaler, distributor, or sales agent of any kind that distributes our registered branded products.