1. Ku hel dhammayn dhalaalaya oo sarreeya waqti aad u yar gudaheed.
2. Waxaa loo isticmaalaa shiididda iyo nadiifinta dhagaxyada kala duwan, dabaqa shubka ah iyo dhamaystirka dhoobada gaarka ah. Sida granite, marmar, dhagax microcrystalline, crystal, dhagax quartz, ceramics iyo wixii la mid ah.
3. Naaxinta qoyan ama qalalan.
4. fiiqan oo u adkaysta xidhashada.