An aluminum hub, professional quality needle. Indivdually packaged in a color coded poly container with 100 per box. Due to state law: Syringes and Needles are not for sale in the state of CT, DE, NH, NJ, NY, and CA without a 'Certificate of Need' Animal SQ size IM size IV size Pig 3/4" x 20 ga 1" x 18 ga 1-1 1/2" x 20 ga Hog 3/4" x 18 ga 1" x 18 ga 2" x 18 ga Sow 1" x 18 ga 1 x 18 ga 4" x 18 ga Sheep 3/4" x 18 ga 1" x18 ga 1" x 18 ga Goat 3/4" x 16 ga 1" x 16 ga 1" x 18 ga Yearling 1" x 16 ga 1" x 16 ga 1" x 16ga Cow 1" x 16 ga 1" x 16 ga 1" x 16 ga Colt 3/4" x 18 ga 1" x 18 ga 1" x 18 ga Horse 1" x 18 ga 1 1/2" x 18ga 1/2" x 20ga Dog & Cat 3/4" x 22 ga 1" x 22 __________