The walls of the rigid bond tubes will stretch slightly each time the tube is fit over an atom peg. The stiff, almost brittle, nature of polystyrene means that the tube walls will not return completely to their original state when disassembled. Should the bond become too loose, the stretched portion of the tube can easily be trimmed off. This is one reason why Orbit Sets include a large selection of bonds. Also, it is very economical to buy additional bond tubes to supplement your Sets.
Wobbly bonds are great when a flexible and durable connection is needed.
Wobblies are very durable and can be reused again and again Virtually indestructible permanent models are possible Wobblies give models a sharp, shiny, professional look Clear bonds make the overall molecular geometry more visible The clear Wobbly bonds provide a half-bonded model. If you like to use molecular models in a classroom setting, Wobbly bonds are virtually indestructible. They will take a lot of abuse over a long period of time and still look great. To insert the atom pegs into the bond tubes, only gentle but steady finger pressure is required. And the fit is tight enough that the parts will stay joined under normal use until pulled apart.