Regular (Normal) tips are approximately 13cm long when connected to the cable.
Short (Special) tips are approximately 10cm long and are designed to produce circulars 40cm in length when combined with a 40cm cable. They are available in sizes 3.75mm - 6.00mm.
Sizes 3.50mm - 5.00mm are $9.50
Sizes 5.50mm - 6.00mm are $10.00
Sizes 6.50mm - 8.00mm are $10.50