Can you tell me if this fits the Arai Signet X?

I don't know how well it fits Signet X; mine is Quantum-X. But I wanted to mention that with the optional fog sheild and sun shield, I ended up just cutting mine to fit where I wanted it to fit. Yea, I had to buy 2 so i could make better cuts the 2nd time around. But, you get the idea.

what is the size for this product

Not sure what you mean by your question. It fits any helmet shield/visor (be sure to order the Arai version if you own an Arai helmet). It fits along the entire top edge of your visor, and is about 1 inch tall. Hope this helps.

What percent visible light transmission?

The Helmet Sunblocker's polymer film's UV transmission is 100% at 260 NM (Normal Wave Length of Sunlight)

Will this work with a pinlock?

It will work and for best results, install the Sunblocker first. Let dry overnight, then install the Pinlock over the Sunblocker. Tip: while soaking in the soapy (Dawn) water, zap it in the microwave for about 30 seconds to "relax" the Sunblocker. This will make it much easier to install.

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Description

🕶️ Ride Bright, Ride Right — Shield Your Eyes in Style!

EFFORTLESS SETUP - Installs quickly with just soap and water—no tools or expertise needed.
RIDE COOLER STAY SHARP - Polymer film finish reduces heat buildup inside your helmet.
GLARE FREE VISION ALWAYS - Eliminates harsh sunlight and glare for relaxed, strain-free riding.
UNIVERSAL FIT ZERO HASSLE - Designed to fit ALL helmets with face shields, including Arai models.
SWITCH HELMETS KEEP PROTECTION - Fully transferable decal lets you move it between helmets without losing UV defense.

The Helmet Sunblocker for Arai Helmets is a dark green polymer film decal that adheres inside any helmet face shield using soap and water. It offers 100% UV protection, reduces glare, and fits all helmets with face shields. Easy to install and fully transferable, it keeps your eyes relaxed and your vision clear without the need for sunglasses or face shield changes.

Specifications

Sport	Motorcycling, snow mobiling
Certificate type	SNELL
Finish type	Polymer film
Number of vents	2
Shell type	Hard
Shape	Round
Closure type	chin strap
Manufacturer	Helmet Sunblocker
Model name	Helmet Sunblocker for Arai Helmets
Color	Dark green
Size	1.5 H x 10.25 L
Style	Full Face, flip up
Material type	Plastic
Features	Fits all helmets, No more squinting, no more glare, no more sunglasses., Eliminates glare, 100% guaranteed, Easy installation, Keeps eyes relaxed, No more changing face shields for day and night riding., Cooler helmet, 100% UV protection, Fully transferable from helmet to helmet
Batteries included?	No
Department	Unisex
Item model number	Arai HSBA
ASIN	B00BSDG7AK