Upgrades and additional chain that can be purchased with thumb splints. As shown in first picture from top:
Fine Chain (comes standard with thumb splints. This selection is for additional chain)
Flat Cable
On left:
Delicate Hearts
Open Stars
Puff Stars
On Right:
Sm Link
Lg Link
Puff Hearts
Deco Hearts
 
Also shown gold filled dapped cable chain upgrade. Sterling silver delicate heart and flat cable chains and titanium fine, small link, or curb chains also available with pics and more options coming soon!
 
Please select your desired metal, chain, and wrist size from the drop down menus.