Sizes:

1x4
12'

1x8
12'

2x4
8, 10, 12, & 16'

2x6
8, 10, 12, 14 & 16'

2x8
8, 10, 12, 14, 16, & 20'

2x10
8, 10, 12, 14, 16, & 20'

2x12
8, 10, 12, 14, 16, & 20'

4x4
8, 10, 12, & 16'

4x6
8, 12'

6x6
8, 10, 12, & 16'

See also Decking & Rails