These are the original TireSkates made by Accessible Systems (now out of business). Purchased in 2008 to facilitate the restoration of my car and have been sitting on them since. 16" long by 8" wide. They come with wide ball bearing casters for ease of rolling. Powder coated red. They are rated at 6000 lbs. per set of 4. These things weigh a ton so shipping them will be costly. Save some money and have a buddy pick them up here in Clovis, CA. Going fast @ $50 out the door for the set of 4 + shipping to your location.