The Senses 2.0 Cat Grass Kit is fresher and larger than the old Catit Grass Garden Refill Kit. The Cat Grass Kit now contains 3 sets of vermiculite and wheat and grain seed mix. The vermiculite bags have been enlarged to improve growing results. This soil is extremely lightweight and enables you to sow with clean hands! For use with the Catit Senses 2.0 Grass Planter (#43161). .