This filler foam is specially designed for Systainer® T-LOC 1-5 (I, II, III, IV & V). Made of rigid 50mm-thick dense closed cell foam, this unit fits into a Systainer®. This unit features a grid of perforated cubes, 15mm x 15mm, so you can customize the inside shape of just about anything you wish to store or transport. Use in conjunction with base foam, and if additional depth and support are needed, you can use multiple pieces.