The Sun recumbent EZ Tandem is designed by Gardner Martin of Easy Racers, Inc.. This bike is built for comfort. There is a small hole in the seat back as can be seen in the picture. I put clear nail polish on it and since it hasn t gotten any bigger I didn t replace it. It is a 27-speed bike. It has Sram Verio shifters and Shimano derailleurs. I am selling this bike for $350.00 or best offer.