Closely related, and in some cases a direct result of collaborations with and for specific players, are the artist models that are specifically available to the public. Some of these models are designed to be near-exact replicas of a noted player's trademark instrument - including the "relic" treatment and the various degrees of ageing (patterns of wear, modifications, stickers and abuse) - such as in the case of the Jeff Beck Tribute Esquire, the Jaco Pastorius ersatz fretless Jazz Bass, and a replica model of Stevie Ray Vaughan's heavily weathered trademark Stratocaster. These models are meticulously crafted by hand, under the supervision of one luthier as opposed to part of an assembly line. Fender makes this distinction by tagging these models as 'Master Built' and 'Team Built'. These instruments are designed to closely replicate the original examples and are very limited in number and often extremely expensive. Far more common under the Custom Shop banner are production models commissioned by players and made available to the general public, albeit in more limited quantity than Fender's standard lines. This line includes high-end models in series such as Custom Classics, Showmasters and Time Machines. Examples of guitars designed by specific players and manufactured by the Custom Shop include signature guitars for David Gilmour, Eric Clapton, Jeff Beck, Albert Collins, Merle Haggard, and John5.