New, our HT Grand Regulation Guides have been designed and made with a higher working temperature of 70°C (158°F) 

As like our standard guildes measurements assist 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, improved 6 Key height 62mm-67mm. 

More stable than wood in order to stay accurate but still flexible. Made in a bright white 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