Ted Klum Model Hard Rubber AltoTed Klum Model hard rubber Alto was designed based on several vintage Berg Larson Altos including Jackie McLeans which he played throughout the 1980s! It is the brightest and most powerful of our hard rubber alto pieces while retaining warmth throughout the range and not thinning out in the upper register. This product was finalized after months of Prototypes and extensive testing and is currently available in sizes 6,7,8,9.