How many fabrics are usually in these? What width?

2 1/2" wide for Jelly rolls
1 1/2" wide for Honey Buns
There are usually 42 strips, but some duplictes depending on the number of fabrics in the fabric line.

go to fat quater shop they have chart of all size pecies suzieq

What is the advntage to using jelly rolls and would you only be using them for a quilts that is nothing but strips. I don't understnad the concept at all.

There are a lot of patterns that use jelly rolls. Most fabric lines that have jelly rolls also have charm packs, layer cakes and fat quarters, which you can use with the jelly rolls. It just depends what you want to make. The advantage is not having to cut your own strips.

The advantages are they're already cut and you get one strip from every fabric in the line.

I have 2 1/2 " strips 4" blocks and 2" blocks.

Go to this web and look at the tutorials and you'll see some easy quilts to make with jelly rolls, honey buns, turnovers, and charm packs: http://tutorials.missouriquiltco.com/

There are some very affordable booklets on Jelly Roll patterns that are really quick and easy. It sure does cut out the time on cutting and often saves money, since you are not having to buy several fabrics. Can be very quick and easy for log cabine quilts.

i used jelly roll strips on this quilt. put them around Batik charms to make larger blks.