Stainless Steel

Insect pins come in two materials:  black enameled steel or stainless steel.

Stainless steel pins are better for humid environments; this is a higher quality pin (which also means these are more expensive pins - no surprise!). 

Interestingly, stainless steel pins are sometimes called "white pins" to differentiate from black enamel pins.  Not actually white.  Go figure.

Also available in sizes 10, 15, 20 and 25 minutens.