Marshalltown Plastic Line Blocks Twigs set

Marshalltown 5' x 2 1/4' Plastic Line Blocks: for running a line when laying bricks/blocks bright yellow impervious to water 2 pairs of blocks.
For running a line when laying bricks or blocks
Bright yellow plastic impervious to water
Includes four plastic line twigs with 2 pairs of blocks
Twigs are used to keep the Mason's line from sagging between blocks 2 pairs