Manufactured from virgin polypropylene and suitable for use with most microtubes, vials and tubes up to 12mm diameter. This 81 place rack is very lightweight and easily transportable and will fit inot polycarbnate racking systems. Also available with slip on clear lid for lutiple stacking. Both the rack and lid have a frosted area for writing on. Dimensions: (HxWxD) 27x137x145mm)