Made from strong durable plastic. Easy fit washers to hold you bubble wrap insulation. 1.5" long with 0.5" wide washer make the small securing clip easy to handle and install. They are black in colour and come in quantity's from 20 - 1000. Our securing pegs can be used to hold insulation away from your greenhouse walls creating an air space which will help retain and control the air temperature. To install simply insert the clip into your greenhouse frame. You then need to push the bubble wrap insulation over the pointed end of the clip and push the washer down on top of that. This process will then need to be repeated until the insulation is pinned at all the relevant points in the greenhouse.