BAM Hightech Contoured Viola Case - Tweed The BAM Contoured Hightech Viola Case is adjustable and can fit instruments up to 43cm (17") It is considered the most resistant, suspension system, lightest and compact viola case in BAM's line. Plush interior, Extremely shock and pressure resistant. Very modern design of carbon black exterior, Two protective anti-wear and anti-skid rubber guards as well as airtight valance seal. Only 3 1/2 lbs. Also available in Tweed exterior.