Very nice Harken Roller Furling unit. Mark III Unit 1.5. I believe the Unit 1.5 is recommended for 36-45' boats.

This was used on a J-35 only a few times and stored inside most of it's life. 

Complete with six seven foot and one thirty one inch sections of foil. I believe that the headstay length on that j35 was around 48' 10".