These pre-drilled chunky wood shapes are a very cost effective way to satisfy the chewing needs of larger Parrots.  Simply thread with nickel plate or stainless steel chain or stack on a large stainless steel coil.  Made from bird-safe dyed softwood.

Approximately:
Rectangle - 12 cm by 9 cm by 4.5 cm (4-3/4" x  3-1/2" x 1-3/4")
Small Angle - 7 cm by 8.5 cm by 4.5 cm (2-3/4" x 3-3/8" x 1-3/4")
Square - 7 cm by 8.5 cm by 4.5 cm (2-3/4" x 3-3/8" x 1-3/4")
Triangle - 9.5 cm by 9.5 cm by 9.5 cm by 4.5 cm (3-3/4" x  3-3/4" x 3-3/4" x 1-3/4")
Large Angle - 12 cm by 9 cm by 4.5 cm (4-3/4" x  3-1/2" x 1-3/4")
Medium Angle -  12.5 cm by 6.5 cm by 4.5 cm (5" x  2-3/4" x 1-3/4")