Advantages of the TPP racks for centrifuge tubes 15 ml / 50 ml: Alpha-numerical inscription to identify your samples A convenient form heat resistant autoclavable material - racks need to be disassembled before packing for autoclaving collapsible for storage: TPP racks with the click system are quickly assembled and disassembled They show no inhibitory burrs on the insertion holes Additional advantages for the TPP rack for tissue culture flat tubes 10: Transparent top Protection rim that prevents horizontally stored tissue culture flat tubes 10 from shifting Advantages fr the TPP rack for TubeSpin Bioreactor 600: Re-usable Stackable Secure footprint Fits 3 pieces of TubeSpin Bioreactor tubes Advantages of the TPP cryo boxes: Intended for storage of samples in a freezer Even after multiple usages the lids can be removed from - or replaced on - the base with ease One-handed for cryo tubes larger than 4 ml boxes with raised lids are available Advantages of the TPP cryo rack with star-shaped insertions: Star-shaped insertion system in the grooves allows one hand operation when used with the star foot TPP cryo tubes Excellent non-slip properties Ready-mounted rubber feet