Non-woven. Quality bags for starts. Size: 3.1"x3.9"/ 8*10cm. Good size for seed starts. Easy to fill and plant. 200 Little bags. Great for small plants that will grow. No need to replant. You just transfer into the larger pot. Save a lot of time and money. Ease of use. Can plant whole thing. Be able to grow more plants in a confined area. These are absolutely perfect for starting seedlings or clones. Make for great liners for potted plants or grow bags. Enables more oxygen to the root system and overall allows plants to grow really strong root systems.