This polycarbonate roller features a lens effect and an anti-slip surface that will not adhere to your materials. The roller pin is adjustable through three pairs of rings that produce different thicknesses (2.5 mm, 3.5 mm and 5 mm). Details: 8.98" x 3.9" package size Anti-slip surface Made of polycarbonate with lens effect Adjustable Produces 3 different thicknesses (2.5mm, 3.5mm and 5mm)