4 Pc Kaleidoscope Set 6" & 8" 1/8" for 6" & 8" Finished Squares W/Holes & Seam Allowance Markings are laser engraved for long lasting use. Set does have seam allowance and guideline holes For finished 6" & 8" Squares 1/8" Thick Acrylic Sizes noted are of the finished square, not of the template.