These concrete dobies come in 5 different sizes:


Wired
1 x 2 x 2
1 1/2 x 2 x 2
2 x 2 x 2
3 x 3 x 3

Wireless
3 x 3 x 2

Other styles of chairs are available in plastics.
Rebar Saddles
Uni-Chairs
Con-Chairs

Wire Chairs