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.

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Description

🛡️ Seal smart, live comfortable—don’t let gaps steal your peace!

VERSATILE HOME HERO - Ideal for expansion joints, window sills, roofs, and more—your go-to for airtight, damp-proof sealing.
DRAFT DUST DEFENSE - Blocks drafts and dust infiltration, boosting home comfort and energy efficiency.
PRECISION GAP FILLER - Seals medium concrete gaps with exact 3/8 inch foam diameter for flawless caulking prep.
EFFORTLESS CUSTOM FIT - Trim or twist to size with scissors—no special tools needed for a perfect seal every time.
ALL WEATHER DURABILITY - Crafted from premium closed-cell polyethylene, it resists moisture, dust, and temperature swings—indoors or out.

The M-D Building Products Versatile Gray Foam Backer Rod is a 20-foot, 3/8 inch diameter closed-cell polyethylene foam designed to fill medium gaps in concrete and expansion joints. Weather-resistant and easy to trim, it provides a durable, airtight base for caulking, enhancing insulation and protecting against drafts and moisture both indoors and outdoors.

Specifications

Manufacturer	M-D Building Products
Part Number	71464
Item Weight	0.6 ounces
Product Dimensions	14 x 8 x 2 inches
Item model number	71464
Is Discontinued By Manufacturer	No
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
Certification	Non-absorbent, closed-cell polyethylene pre-caulking material
Included Components	MD Building - 71464 - 2pk
Batteries Included?	No
Batteries Required?	No
Warranty Description	All M-D products are warranted to be free from defects in material and workmanship if installed and used in strict accordance with our installation instructions. Our liability is limited to our sale price of any products proved to be defective or, at our option, to the replacement of such products upon their return to us.

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