Rootrainers Provide The Best Growing System For Seeds, Plugs And Cuttings By Way Of The Deep Ribbed Cells Which Help Seedlings Develop Strong, Fibrous Root Systems.the Unique Open-bottomed Design Of The Cells Allow Earlier Root Tips To Make Contact With The Air And Die Off, Which Are Replaced By Fresh Young Roots. The Re-usable Cells Hinge Open To Allow Easy Removal Of The Plant, With No Root Disturbance, Ready For Transplanting.available In 12cm Deep Only64 Cell Pack Consists Of 2 Trays Of 32 Cells - Giving A Potential Of 64 Plantsdeep Rootrainers Are Ideal For Beans, Sweet Peas And Strawberries And Other Deep Rooting Plantsre-useable Cells Simply Hinge Open To Allow The Plant To Be Removed Without Damaging The Rootssee Our Extra Value Twin Packs And Save 2.95