Light-proof Opacity: The black side of the filament storage bags can cover light and is very useful for printing materials that are not light-proof(Excluding pump) Plus Size Filament Storage Bags:12.6 x 13.4in(32cmx34cm) is the perfect size to fit all of 3d printer filament 1 kg spool. The 30cm size is too small for many filament reels and difficult to use PA+PE Material: The upgraded PA+PE material has improved the quality of the bag, making it wear-proof and scratch-proof, and less prone to damage Wide Compatibility:Suitable for most 0.5KG/0.75KG/1KG filaments and 1.75mm/2.85mm/3mm filament, compatible with PLA/PETG/TPU etc. Convenient Management: The transparent side of the vacuum bag has a label that can record the material and sealing date of the filament, allowing you to quickly check the material of the filament without opening the bag Color: Black & Gray Material: plastic Package Contents: 20pcs * Refill Bags Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.