Space Maintainers kit contains one of each size for total of 50 Bands and 50 Wire

L25, L26, L27, L28, L29, L30, L31, L32, L33, L33 1/2, L34, L34 1/2, L35, L35 1/2, L36, L36 1/2, L37, L37 1/2, L38, L38 1/2, L39, L39 1/2, L40, L41, L42

U25, U26, U27, U28, U29, U30, U31, U32, U33, U33 1/2, U34, U34 1/2, U35, U35 1/2, U36, U36 1/2, U37, U37 1/2, U38, U38 1/2, U39, U39 1/2, U40, U41, U42

also included

21 Narrow wire W/O rest

8   Wide Wire W/O rest

10 Narrow Wire W/Drop Loop

4   Wide Wire W/Drop Loop

4   Narrow wire W rest

2   Wide wire with rest

1   narrow wire W/Distal Shoe