A Mandala is like a visual mantra. It often symbolically symbolises the environment around the deity who resides in the center. This is analogous to you dwelling in the center of your experience and your environment is an extension of your sense consciousnesses which vibrate out from the center and back in. The size of this beautiful mandala thangka is 30x 30 cm approximately.
A vajra (or dorje in Tibetan) is a ritual weapon symbolizing the properties of a diamond (indestructibility) and a thunderbolt (irresistible force) and is the Sanskrit word having both meanings. The vajra is a type of club with a ribbed spherical head.