This forms a solid solution that is more brittle and susceptible to breakage. They also help prevent nail biting, breakage, and splits. Coated glassware is specially treated to reduce the occurrence of breakage or failure. They are less prone to breakage and much cheaper. Unfortunately it was prone to breakage and getting entangled in vegetation. This was done to prevent the breakage of launcher parts. However nephrite is tougher and more resistant to breakage. The grain size is usually controlled to reduce the probability of breakage. It also allows the reamer to start straight and reduce the risk of breakage. Borosilicate is preferred for its strength and resistance to breakage. Such installations will frequently result in a cable breakage. McClintock observed the breakage and fusion of chromosomes in irradiated maize cells. Toughness relates to the ability to resist breakage from falls or impacts. The most common complications include lead migration, lead breakage, and infection. Some units are hardened against drops and screen breakage.