Description Our Grand Regulation Guides have been designed and made with 6 Blow distance 43mm-48mm, 6 Set off/let off 2mm-7mm, 6 Damper lift, 21.5mm-24mm can also be used to help judge checking, 6 improved key height 62mm-67mm. More stable than wood in order to stay accurate but still flexible. Made in an ivory colour to enable easy reading when in action. Individually marked for ease of use and supplied in a purpose made compact and protective case. The guides are designed in a superior thermoplastic polymer still softer than copper so not to damage bass strings when in contact but a climatically stable material unlike wood, staying accurate but still flexible Materials PLA filament Maximum working temperature of PLA is typically around 57°C (134.6°F), and anything beyond that can cause the material to soften, deform, or lose its structural integrity.