This is a very appealing unit - but the predesigned plastic pressure arches are too 'open' for both Rico and Vandoren reeds for the clarinet (Bb).  I've ruined two reeds as the tip of the reed can easily get pinched by the hinge in any of the outside slots.  I'd block those four - but the remaining slots are also at risk - not worth the price!  A good reed easily costs $5 to $10 after culling out the less than great ones - and two destroyed reeds exceeds the cost in this item.