AR6316S:  $19.80 per set of 6 sizes:

Start at 4 x 4 x 3.25 high and end at 7.75 x 4 x 6 high.

They are all 4” deep and 3/16” thick clear acrylic.

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AR135S:   $13.20 per set of 6 sizes:

Start at 4 x 4 x 1 high and go up in ½”

increments in width and height. 

The largest is 6.5 x 4 x 3.5 high.  

They are all 4” deep.

AR4S:   $12.10 per set of 4

1/8” thick starting at 3.5w x 4d x 2 high and going up in increments of 1” height and ½” width increments. Largest riser in this set is 5” wide x 4 deep x 5” high.

AR3S:   $11 per set of 41/8” thick acrylic starting at 3.5”wide x 3”deep x 2” high and going up in increments of 1” in  height and ½” width increments. Largest riser in this set is 5" wide x 3" deep x  5" high.