The size and composition of a marching band can vary greatly. Some bands have fewer than twenty members, and some have over 500. American marching bands vary considerably in their instrumentation. Some bands omit some or all woodwinds, but it is not uncommon to see piccolos, flutes, soprano clarinets, alto saxophones, and tenor saxophones (woodwinds are not used in drum corps). E♭ clarinets, alto clarinets, bass clarinets, and baritone saxophones are less common, but can be found in some bands. Bassoons and oboes are very seldom found on a field due to the risk of incidental damage, the impracticality of marching with an exposed double reed, and high sensitivity to weather.