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

SEAL LIKE A PRO - Creates a sturdy base for caulking, enhancing adhesion and durability
EFFORTLESS CUSTOMIZATION - Trim or twist to perfectly match any joint size—no extra tools needed
PRECISION FIT EVERY TIME - 3/8-inch thickness ensures a snug, professional seal for medium gaps
MULTI PURPOSE GAP SOLUTION - Ideal for driveways, windows, doors, and roofs—boosts insulation and blocks drafts
BUILT TO BRAVE THE ELEMENTS - Crafted from weather-resistant vinyl and silicone for lasting outdoor and indoor use

The M-D Building Products 71464 Backer Rod is a 3/8-inch diameter, 20-foot long, gray gap filler made from durable, weather-resistant vinyl and silicone. Designed for both indoor and outdoor use, it provides a reliable base for caulking, effectively sealing medium-sized joints to prevent drafts, dust, and moisture intrusion. Easily trimmed and installed, it enhances insulation and weatherproofing across a variety of home improvement projects.

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Manufacturer	M-D Building Products
Part Number	71464
Product Dimensions	35.56 x 20.32 x 5.08 cm; 17.01 g
Item model number	71464
Size	1 Pack
Colour	Black
Style	Backer Rod
Material	Rubber, Silicone, Vinyl
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
Item Weight	17 g

M-D Building Products 71464 Backer Rod For Gaps and Joints, 3/8-by-20 Feet, Gray

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