The $20 "Get Started Pack" includes your first month of instrument rental, book and basic maintenance items. 

The regular monthly rental payment begins second month of rental. The monthly payment of $19.00 includes $15.00 for the monthly rental (which may be applied to your purchase) and $4.00 for a maintenance and replacement plan to protect your instrument, plus tax.

Bow, rosin, and case are included in the rental price.