Test Tube Rack, 60 Holes 16mm Strong Light Plastic 3 Tiers Easy Assembly Centrifuge Tube Holder for Laboratory School : Amazon.ca: Industrial & Scientific
Scienceware 18860-2125 Test Tube Rack, PP, for 21 to 25 mm OD Tubes from Cole-Parmer Canada
Test Tube Rack, Centrifuge Tube Holder (2 Pack - Blue and Orange) for 10ml, 15ml, 50ml, Detachable Plastic Stand, 28 Well : Amazon.ca: Musical Instruments, Stage & Studio