I ordered these based on the good reviews and have not been disappointed.  The resistance bands themselves are well-constructed and seem to be very durable.  I have only had them for a few days, but their quality construction is impressive and I believe that they will provide high performance for an extended time period.  I am very pleased with this purchase and would not hesitate to buy additional merchandise from Black Mountain Products.&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Black-Mountain-Products-Resistance-Band-Set-with-Door-Anchor-Ankle-Strap-Exercise-Chart-and-Resistance-Band-Carrying-Case/dp/7245456313/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Black Mountain Products Resistance Band Set with Door Anchor, Ankle Strap, Exercise Chart, and Resistance Band Carrying Case</a>