80 to 100 This filament is suit for low temperature 3D pen only, with its optimum printing temperature ranging from 80 to 100. 1.75mm Diameter is 1.75mm with tolerance of +/-0.02mm; compatible with most 1.75 mm 3D pens and printers. PCL It is made from food grade PCL, which is green and environmentally friendly. 20 colors There are 20 different colors, which makes this product a great material for low temperature 3D pen to create colorful projects. reusable In 50 boiled water, it can be changed into a substance like plasticine, thus can be reshaped.