The regular alphabet blocks are the same size as the ones you find at the toy stores. They are great for medium birds. The jumbo alphabet blocks are great for large birds (macaws, etc.), or any medium bird that is wood-happy. Small Wood Hexagon Number Block WDA2$0.25, 12 for $2.40, 100 for $14.99 Large Wood Hexagon Alphabet Block, 1-1/2" (12pcs) Back in stock!! WDA4$2.99, 12 for $29.99 Mini Wood Alphabet Blocks, 18pcs WA015$2.50, 5 for $10.00 Small Wood Alphabet Blocks, 18pcs WA020$3.00, 5 for $13.50 Regular Wooden Alphabet Blocks, 18 pcs WA030$4.40, 5 for $18.50 Jumbo Alphabet Block 1 pc WA450$0.80, 12 for $7.20, 50 for $20.00