Highlighted weapons are free options.
Sandrone is used with Electro and Cryo characters to activate her Radiance: Stellar-Conduct state and deal massively increased damage. Sandrone is a character who uses her Charged Attack to deal damage while refreshing its uptime with her Skill. She often uses her Burst for the extra damage it provides.
Without consistent Cryo Resonance active, weapons with CRIT Rate will perform slightly better than listed.