Cleanroom Paper Constructions: 100% Virgin Wood Pulp Color: White, Sky Blue, Light Blue, Light Yellow, Light Green, Orange, Pink and etc Size: A3, A4, A5, or Customized Sizes. Weight: 72gsm, 80gsm Class 100 (ISO 5) Cleanroom processed. Double packed with Cleanroom bags. Features: --Recyclable and environmental friendly paper. --Compatible to most inks in writing without smearing. --Low ionic contamination. --Low particle and fiber generation. --Excellent heat resistance material for laser printing and photocopier