The weight is about 6 grams(Cross-3.7, Chain-2.3 grams). The chain is about 18"(45 cm) long.
The size of the top --- Length-32 mm(40 mm w/Top ring), Width-19 mm, Thickness-1.8 mm approx.
The size of the chain Link---Length- 4 mm, Width-2 mm, Thickness-0.4 mm approx.
The type of chain is known as a Cable Chain.