Features: 1) Material: a) Chrome-plated frame / brass frame b) Red color glass bulb c) Chinese glass bulbs, German glass bulbs, UL listed glass bulbs 2) Models: a) ZSTP-15: conventional type b) ZSTZ-15: upright type c) ZSTX-15: pendent type d) ZSTBX-15: sidewall pendent type e) ZSTBS-15: sidewall horizontal type 3) Glass bulb working temperatures: 57 / 68 / 79 / 93 / 141癈