I have quantities of the heavy duty cardboard tubes available in 4 and 6 tubes. Ordering is easy. TAB down to where it says "# Of Cardboard Tubes". These Heavy Duty Cardboard Tubes 11" - 12" Long x 3" Wide Craft Art Projects were from rolls of bubble wrap.
Bargain Paradise 30 Pack Craft Rolls - Round Cardboard Tubes - Cardboard Tubes For Crafts - Craft Tubes - Craft Round Tubes - Paper Tube for Arts & Crafts
24 White Cardboard Tubes for Crafts, Empty Paper Rolls, Cylinders in 3 Sizes for DIY Art Projects (4, 6, and 10 Inches)
Bargain Paradise 30 Pack Craft Rolls - Round Cardboard Tubes - Cardboard Tubes For Crafts - Craft Tubes - Craft Round Tubes - Paper Tube for Arts & Crafts
25 Inventive Cardboard Activities and Games for Learning
Bargain Paradise 30 Pack Craft Rolls - Round Cardboard Tubes - Cardboard Tubes For Crafts - Craft Tubes - Craft Round Tubes - Paper Tube for Arts & Crafts
Use the heavy duty cardboard tubes while crafting at home or in the classroom to encourage young children to unleash their creativity. Use acrylic paint, watercolor, stencils, stickers, glue, glitter, and scissors to decorate and shape each 5.9-inch empty cardboard tube.
24-Pack Cardboard Tubes Craft Rolls Empty Toilet Paper for Kid Art, Brown 3.9
Sturdy 12 inch Paper Cardboard Tube Craft Rolls 22 Pieces : Arts, Crafts & Sewing
LARGE HEAVY DUTY CARDBOARD TUBES 12X 3 CORES FOR ARTS & CRAFT- PREVIOUSLY USED
Cardboard Craft Tubes Choose Your Amount Thick Sturdy Multi Use Tubes
50-Pack Large Corrugated Cardboard Sheets for Mailers, 11x14 Flat Packaging Inserts Pads, Shipping, Packing, Mailing, Dividers, Crafts, DIY Art Projects Supplies (2mm Thick)