Björn handled the extreme and difficult cases that other repairmen wouldn't touch because they thought they'd take too much time or were considered hopeless repair opportunities. BJFE pedals are enclosed in a 110x60x30mm chassis, in an ELFA K-430 enclosure for most pedals. The circuit boards are wrapped in neoprene, which is a kind of rubber used in diving suits. The neoprene is capable of withstanding heat, water, and other fluids and it cushions the electronic components inside. The circuit board is also sealed to preserve trade secrets. The first BJFE pedals were painted in nitrocellulose—beginning in 2002 the pedals are handpainted in oil. Oil is much more durable, and ages well. Björn Juhl states that the colors are chosen to provide a pleasant palette. Each model comes with unique artwork inside the back pedal cover, painted by hand. Current models listed here, along with a description. A more full description of all the BJFE pedals complete with their history can be found on the BJFE Pedal Descriptions independently maintained by David Cittadini on the thread on the BJFE Forum. BJFE overdrive pedals add a "touch sensitivity" to the distortion in most cases- picking lightly or slight reductione in the volume knob position reduce the distortion. Björn was asked by his BJFE pedal distributor, Harri Koski, to consider designing amplifiers. Björn was fairly busy building and designing pedals for the BJFE line, and did not have the time to also build amplifiers. It was suggested a new company be created where Björn could design the effects and amplifiers, but they would be constructed and distributed under the name Mad Professor Amplification. These are pedals and amplifiers designed by Björn but not hand built by him.