This is a set of Travel Trac cycling rollers from Performance. They are manufactured from lightweight aluminum and fold in half for easy storage. For the cyclist seeking to improve their bike handling skills while riding indoors, these rollers are unequaled. Because you're actually riding the bike, the benefits of riding rollers surpass that of any stationary trainer. The roller tubes spin smoothly and quietly, and the roller band shows no sign of wear. I will consider any reasonable offers. Thanks.