These are very rare, the only one's on Ebay and the only one's on the internet, replacement bases for the Sled Dogs Snowskates. These purple bases are a size medium, check our other auctions for the size Large, and were from the original model series(SD100-150-200?). The size medium's measure about 12" Long and are the plastic bases with NO metal edges. We were a Large dealer of the original Sled Dogs and we just uncovered these while cleaning out some of our storage space. They are Brand New in the original plastic packages with the Original price tag still on them. Winning bidder will pay $10.00 for shipping in the continental US. International bidders contact us during the auction for shipping costs.