Types of Blending Tools:

• Cotton,
• Cotton buds,
• Paper stumps / tortillas,
• Brushes,
• Fanning brush,
• Soft Rag,
• Kneaded eraser,
• Makeup sponge,
• Micropore Sponge,
• Palette knife,
• Potter’s tool,
• Color shaper,
• Hard eraser,
• Turpentine etc.

Reference:
http://www.oilpastelsociety.com/OP%20Primer-Tools%20for%20working%20with%20Oil%20Pastels.pdf