This item is a brand new set of Rear Brake Drums, Shoes, Springs and Wheel Cylinders. They will fit the following makes and models:

1999-2001 Nissan Altima 2.4L With drum brakes

Kit Includes:

2x Part# 11-3521 New Balanced Rear Brake Drums 
1x Part# B756 NB756 New Organic Brake Shoes 4 Shoes 1 Set
1x Part# 17362 17362K Rear Brake Shoe Spring Set , both sides
2x Part# W610021 New 134.42001 135.42001 Rear Wheel Cylinder