Partially Composted Pine Bark Fines . They are larger while the mulch is finer. Our supply options include delivery in bulk, bulka bags, and bagged products (such as 20kg & 25 / 30 / 60litre bags). The 511 mix 5 parts pine bark fines (partially composted fines are from www.pinterest.com It’s free bulk wood chips and you can specify the the type of wood chips that you want. Some members shred large pine bark nuggets to make mulch / fines. Produced from mixed conifer bark with a high percentage of spruce.