how many feet come in a 3 pk?

Both INDIVIDUAL packs - the 3/8" and the 1/2"- are 20 feet long.

no 1/4" one? either 20 or 50ft?

Not in this brand, but Amazon offers 1/4-inch backer rod in various lengths, from 10 feet to 100 feet, from other brands. Just search on "Backer Rod 1/4 Inch".

can the backer rod be sliced for smaller openings?

I have not done that, but it cuts easily with a sharp knife or scissors, so you should be able to slice it to fit whatever opening you have. It's good stuff!

Can his be used for exterior windows before caulking?

I used it to push into larger cracks in my driveway before applying concrete filler, and it worked great. I'm thinking that it should work well for filling in spaces around your windows prior to caulking.

Manufacturer	M-D Building Products
Part number	71464
Item Weight	17 g
Product Dimensions	35.56 x 20.32 x 5.08 cm; 17.01 g
Item model number	71464
Size	20 Ft.
Color	Black
Style	Backer Rod
Material	Rubber
Pattern	Solid
Shape	Round
Item Package Quantity	1
Number Of Pieces	1
Measurement System	US
Specification met	Non-absorbent, closed-cell polyethylene pre-caulking material
Included components	MD Building - 71464 - 2pk
Batteries Included?	No
Batteries Required?	No

M-D Building Products

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