Package of 25 PLA plastic refills for 3Doodler. These plant based PLA plastic refills are more rigid than the ABS plastic refills and can be used to doodle on glass, ceramic or metallic surfaces. The PLA plastic refills are particularly well suited to building structures as the rigid plastic is capable of making acute angles and hard edges. Heat setting: 190 - 240 °C/374 - 464 °FFeatures: Hard but more brittle than ABS when bent, more likely to snap when bent or flexed Vulnerable to degradation due to moisture and sunlight, as well as overheating in processing, more prone to overheating than ASB which can cause dripping and degradation. It can droop as it gets too hot. Much stickier than ABS. Sticks very well to acrylic, not as well suited to peeling off paper stencils as ABS  PLA is a biodegradable and recyclable plastic Doodle on windows and other smooth surfaces