• Transparent stickers that allow you to see the puzzle designs even after storing it. • Includes 16 adhesive sheets made of PET material, size 18 x 25 cm. • Suitable for 2 x 1000 piece puzzles or 4 x 500 piece puzzles. • The adhesive sheets can be adjusted to fit your puzzle, even for puzzles up to 6000 pieces. • Easy to use: simply remove the backing from the adhesive sheet and stick it to the back of the finished puzzle. • Product dimensions: 20 cm wide, 0.5 cm high, and 15 cm long.