do these work on the thumb?

It depends on how long your thumb is I have really short fat fingers and had to return these and make my own splint

how do I know what size to get, I see no guidance for this.

There is a pdf file link in the full product description. It asks you to print out a sizing band at default printer settings. However, using a new Brother printer, it printed out 1/16 of an inch too small, and I had to bump it up to 103% to make it match the 3½" marker on the printout.

Are these very rigid or semi-flexible? Could I type while wearing it?

They are Rigid n strong. I use one on my pinky n one on my thumb and I type all day on & off with these. I have RA and when my fingers are swollen n stuff, to bend them gives me extreme pain !! So I bought these splints to prevent my fingers from bending you can take them off, move them around. Also another note: I have bigger sizes, there’s one where it comes w/ 32 sizes on a big round keychain. When my fingers r swollen or if ur finger is Broke, you will go they several different sizes. So getting the 3 pack in ur size is perfectly fine, but you may need a few in the sizes before & after I hope this helps !! Good Luck !!

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Brace On EZ Finger Splint, Finger Brace for Injuries and Support, Trigger Finger Splint, Trio 3-Pack, Sizes 10, 11, 12

Product ID: 150612907

Details

Brand
Brace On
Color
Clear Beige
Size
3 Piece
Specific Uses For Product
Mallet Finger
Use for
Hand

💧Water-resistant durability

📏44-piece assorted sizes

🔄Reversible adjustable fit

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MOP$90

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Description

🖐️ Support your fingers, support your hustle—comfort that keeps up with your life.

BUILT FOR REAL LIFE - Waterproof and durable materials mean you never have to remove your splint during daily tasks—stay supported 24/7.
FLIP FIT TECHNOLOGY - Unique reversible angle lets you switch between snug or relaxed support in seconds—no straps, no hassle.
TAILORED FIT FOR EVERY FINGER - 44 splints in assorted sizes ensure a perfect fit from thumb to pinky—custom comfort that adapts to you.
COMPLETE KIT WITH SMART STORAGE - Versatile finger support plus a sleek storage case keeps your healing essentials organized and ready to go.
WEAR IT ALL DAY FORGET ITS THERE - Ultra-lightweight, low-profile design offers seamless comfort whether you’re working, sleeping, or on the move.

The BraceOn EZ Finger Splint Trio 3-Pack offers 44 durable, water-resistant splints in assorted sizes with a reversible design for customizable finger support. Lightweight and low-profile, these splints provide all-day comfort and secure immobilization for trigger finger, mallet finger, and joint injuries, making them ideal for busy professionals seeking discreet, effective healing.

Specifications

ASIN	B07S6Z733T
Best Sellers Rank	#57,345 in Health & Household ( See Top 100 in Health & Household ) #74 in Finger Splints
Brand Name	Brace On
Color	Clear Beige
Customer Reviews	4.2 4.2 out of 5 stars (1,108)
Item Dimensions	5 x 3 x 1 inches
Item Weight	1 Ounces
Manufacturer	Brace On
Material	Plastic
Size	3 Piece Assortment
Specific Uses For Product	Mallet Finger,Crooked,Hypermobility,Trigger Finger
Target Use Body Part	Hand
UPC	726481279833
Unit Count	1.0 Count

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MOP$90

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In stock

Sold byAmazon MacauDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Macau.

Secure transaction

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