Blackburn C Trumpet Tuning Slide for Bach Stradivarius*Blackburn slides are made to order. Lead times vary, but the average is about 2 weeks* Blackburn's tuning slides are among some of the greatest in the world. They are all handcrafted in the USA. Blackburn's tuning slide are especially great when paired with a Blackburn leadpipe. Click here to learn more about the leadpipes! The slides are available in round or semi square crooks. A round slide produces a free blow with an open feel. The semi square