This is a modular dragon that uses a ball and socket system.  You can take it apart and make a new dragon over and over.  The base dragon comes with 1 head, 2 feet, 3 body segments (4 sections each) and 1 small tail.  You can purchase additional parts to make your dragon as long as your want or with 4 wings, 6 feet, 2 heads, etc.  The possibilites are endless!
 
Additional parts
Head (regular or flare) - $3
Feet - $4
Wings and socket - $10
Body segment (single link) - $1
Body segment (4 sections) - $4
Body segment (8 sections) - $7
Body segment (26 sections) - $12
Forks (2 or 3 balls) - $2
Reverse forks (2 or 3 balls) - $2
Tail (small) - $6
Tail (medium) - $7
Tail (large) -  $10