This is a size 4mm / US G/6 crochet hook.It is aluminium with a soft silicon grip
Guide to crochet hook sizes - Gathered
Soft Touch Crochet Hook G (4mm) – Clover Needlecraft, Inc.
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BCMRUN 4 mm(G) Crochet Hook, Ergonomic Handle for Arthritic Hands, Soft Rubber Grip Extra Long Knitting Needles for Beginners and Knitting Crocheting Yarn (4.0mm-G)
How to Choose the Right type and size of a Crochet Hook?
Susan Bates Silvalume Bamboo Handle/Aluminum Head Crochet Hook - Discontinued Items
Softgrip Crochet Hook 3mm, 3.5mm, 4mm or 8mm
9pcs Crochet Hook Kit 2.5-6cm Ergonomic Soft Handle Aluminum Hooks Set with 8 Sizes for DIY Crafts Knitting Crocheting Supplies - AliExpress
Clover Soft Touch Crochet Hooks have an optimal shape for smooth crochet work, and a special handle Lightweight and ergonomic. This crochet hook is designed to make crocheting comfortable for fingers and hand. The crochet hook has a built in soft cushion for easy crocheting. (size H - 5.0mm).
Clover - Soft Touch Crochet Hook (Size: 2,75 mm)
Susan Bates Bamboo Handle/aluminum Head Crochet Hook Size G-6 4mm Crochet Supply Dcoyshouseofyarn - Norway
Soft Grip Crochet Hooks 2mm 2.5mm 3mm 3.5mm 4mm 4.5mm 5mm
This is a size 6mm / US J/10 crochet hook.It is aluminium with a soft silicon grip
Soft Grip Aluminium Crochet Hook Size 6mm / J/10