Ronstan Series 40 All Purpose Block - Single - Universal Head - RF41100

Ronstan Series 40 All Purpose Block - Single - Universal Head - RF41100

Marsoni

M251S

$21.99

Get it in 3 business days with 1 day shipping. Friday, May 29

Ronstan Series 40 All Purpose Block - Single - Universal Head - RF41100Ronstan Series 40 All Purpose Block Single Universal Head RF41100 Series 40 All Purpose Block Single Universal Head All purpose (AP) blocks are a great all around solution. Self lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising

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These fit my 2025 Honda crv hybrid sport-l perfectly. They are much more economical than having the shop replace them. I wish it said what the composition is- cotton or otherwise, because I have read you should oil cotton filters to work as intended. I didn't oil them amd so far haven't had any problems, but time will tell. They are a great value for the money and work as described. I would recommend these if you want to save some money on parts and labor for replacing your air filters. There are some good videos online that show you how step by step. I haven't noticed any odors or lack of durability since installing them.

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Reviewed in the United States on April 3, 2026

Verified Purchase

Guy Defibaugh

Grantham, US

★★★★★ 5

Good replacement for oem

Size: CRV 2023-26 2.0L Hybird

Fits my 2024 crv hybrid

WAS THIS REVIEW HELPFUL?YesReportShare

Reviewed in the United States on May 30, 2026

Verified Purchase