RIOCOCO PCM At Home Coir Plug is a super washed coir pellet with compressed coir fiber and natural pith material. Our Coir Plug is made with carefully selected fine grade coir materials. The plug is wrapped in biodegradable paper and sealed on the bottom. They can be used in propagation trays that have an opening of at least 32mm in diameter. Each pack comes with 20 plugs for you to be able to use for cloning, or seeds, of your favorite crops. With 20 plugs you can even share your rooted plants with friends. Stage 1 growth and easily transplants into the RIOCOCO PCM At Home Veg Block.