This is the most affordable fretless 5 string inside the TRB family.
Comfortable, easy to play in tune (thanks to the fretlines) and with a wide array of sounds, this bass is a great addition for any bass player looking for that sweet fretless sound.
From Yamaha's website:
Demanding bassists have long appreciated the beauty and unparalleled playability of the TRB Series basses. These top-of-the-line instruments feature active electronics, a 35" scale neck, and premium grade materials to create the finest basses for the most discriminating players.
With the TRB1005 and TRB1006, ultra high-end quality instruments are finally available to working bassists. Rosewood fingerboards with oval mother-of-pearl inlays sit atop bolt-on 3-piece 35" maple necks. The bodies are premium quilted maple on alder and house two custom Alnico humcanceling pickups which feed an active preamp with 3-band EQ. Black hardware and a solid brass bridge are standard. TRB1005 is also available fretless.