About Substance Collectables.com: We are now celebrating our 10th year of dealing with boxing memorabilia on the internet. To celebrate we have launched this new and improved boxing memorabilia web site with improved design and even more additional exclusive sports memorabilia we have, through reputation, become one of the most trusted web sites in the industry, serving customers across the world. Our Customers are repeat customers. We are always upgrading and updating our site so please visit our site for new items that are always being adding to our website.

History: We appreciate the support from our many loyal customers who seem to appreciate the fact that unlike any other business we ourselves are avid collectors of boxing memorabilia and invest back into the collection. We build strong relationships with our customers and it will always be our goal at SubstanceCollectables.com to make your experience a successful and memorable one. We will always endeavour to keep offering exclusive memorabilia collection.

Authenticity: All of our Autographs come with a certificate of Authenticity that Guarantees that the autograph is genuine. This is a Lifetime Guarantee. Most of our autographs also come with either a photograph from the auctual signing, security hologram, or a video from the signing, Since 2001 All Muhammad Ali autographs are issued with an additional Certificate of Authenticity and unique serial number that is issued by Muhammad Ali's Management company Online Authentics.com

Substance Collectables Memorabilia provides an online registry that enables collectors to verify their Certificate of Authenticity. All registered items have a unique serial number assigned which allows collectors to verify their items by simply entering the registration number into our website. It is our mission to help collectors know that the items that they spend their hard earned money on are absolutely 100% authentic.

Substance Collectables Memorabilia Certificates of Authenticity have changed over the years. Please look on your printed certificate for the number, or, your signed item may have a number on the hologram. Please enter the number to verify your Certificate.

Substance Collectables Memorabilia is one of the internet's largest growing sports memorabilia retailers in the industry with over hundreds of different hand signed authentic items to choose from and many different styles of display cases for the memorabilia. With it's corporate headquarters in New York, it has shipping facilities in New York, California, Nevada. A large selection, competitive pricing and excellent customer service are the roots of our establishment.

Our line of sports collectibles includes items from sports heroes of today as well as yesterday. As a Retailer/Distributor, we have access to large quantities of inventory to meet our rapidly growing customer base. Substance Collectables Memorabilia obtains all of it's sports memorabilia from only the top names in autograph collecting, Athletic Promotional Events, Mounted Memories,  Sports Productions and through taking part in public and private signings.